Surely the best solution is to tweak the digger mask so it no longer leaves that single pixel?

As far as I know, the digger mask for the first stroke was changed from 2 addictional pixels to only 1 pixel. As this change was deliberately made, I expect that namida has very good reasons for this and therefore refrained from suggesting to undo this change.
And the current mechanics always leave this overhang, independantly of the starting position.

One can either add a floor check...

Adding general floor checks (or low ceiling checks) might create problems with terrain additions, e.g. via building stairs/platforms against the wall. I would add such checks only for the very beginning.

1) Climber ignoring the lowest 6 pixels of terrain
Just to give an example of the current behaviour, I made a little level TestClimber.lvl (just watch it and do nothing; if you want some fun, try to predict the path the lemming takes ).
namida's suggestion (to allow climbing through terrain when hoisting immediatly afterwards) would make the conversion of L1/Lemmix/Lemmini levels easier, but adds another rule (i.e. makes gameplay more complicated). And I don't yet understand what would happen in my test level? Would the lemming try to climb and behave (at least for the very first part) as in the current version, or does he simply turn around? I feel that simply turning around would be more appropriate.

2) Climber and very small overhangs
See the attached picture: When digging down a miner shaft, one or two pixels remain at the top. Thus currently there is precisely one side of the digger hole that a lemming may use to climb out. In L1/Lemmix/Lemmini the opposite happens and lemmings can always climb both sides (due to slightly different digger mechanics).
So the question is: Should the climber be able to ignore such very small overhangs (consisting of only one or perhaps two pixels)?
Arguments for NO (current NeoLemmix mechanics):
- Simpler rules, i.e. no exceptions.
- New trick to turn around climbers (without having to use builders) that can be exploited in levels.
Arguments for YES:
- The current behaviour may break old levels without having an easy fix or introduce new backroutes.
- IMO letting lemmings climb out on both sides creates more interesting design options.
I can live with any of the options, but feel that we should be aware of the consequences of our choices.

Fall distance is not directly editable in NeoLemmix levels. It only exists in the form of "Cheapo Mode", which is strongly advised against using in any new levels, and exists only for the purpose of converted Cheapo levels - it should be noted also that the fall distance change here cannot be decoupled from the other changes that Cheapo Mode applies. The "Fall Distance" option you see in the editor that allows directly choosing a value is for (Super)Lemmini levels, which do support arbitrary distances; this option is disabled when editing a (Neo)Lemmix level.

I am talking about the option "60Px Fall Distance" I see in the System.DAT Editor. As this is checked e.g. in the LPDOS preset, I thought one could change this for NeoLemmix levels as well?

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- glider mechanics (when do they turn around compared to just drop a little in height?)

IIRC, it's consistent with swimmers (or walkers in no-gravity levels).

I never claimed it was inconsistent. But I cannot (in any of these cases) decide what will happen simply by only looking at the terrain. The glider is the worst in this respect, because it is not easy to determine the pixel it is positioned on.

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Entrance order, you can make 4 instead of 2 hatches and get any entrance order you want.

Which is precisely why there is zero logic in not having that option. Because the exact same effect can be achieved simply by placing however many entrances is needed for the desired order. So, it makes sense to allow simply choosing a custom order out of X number of custom exits, rather than requiring some to be duplicated (which would be an especially huge headache if the level designer later decided to change the order).

Sorry, but due to this option I always place 4 hatches in a level instead of only 2 or 3 and I cannot confirm that changing the order is an especially huge headache.
I think Simon's argument goes as follows: The standard option will be used in most levels and only few make use of doubling up hatches to change this order. So it boils down to the question: What does the player expect and then get in a level where the entrance order does not matter?
And as you said: Having this option doesn't create more choices for level designer. So we might look to secondary arguments to decide whether to keep this option or not. And Simon has such an argument against it.

Two solutions for Stonecrest V3. Both use the same (and only one) exit.

namida has recently opened up the discussion for small physics changes for NeoLemmix V2.00, so I will start by discussing one pecularity of bomber mechanics.

It concerns bombing in miner shafts: The bomber hole slightly depends on the direction the lemming is going! See attached picture. Upper row shows the two choices of bomber holes for lemmings going down, the lower row does the same for lemmings walking upwards. The bomber holes for ascending lemmings is actually one pixel further to the left that for descending lemmings.
This small difference has one rather big consequence: Only ascending lemmings can create bomber holes that turns other lemmings around - descending lemmings cannot!

I suggest changing the bomber placement for descending lemmings into the one for ascending lemmings. This way it is unlikely to break any existing levels (as turning lemmings in such bomber holes was already possible in original Lemmix and NeoLemmix up to now), but makes the behaviour uniform.

Simon has vented his rage on the NeoLemmix player, so I may have my own little rant about the NeoLemmix editor .

1) Missing documentation
There is no readme file coming with the editor, explaining all the buttons, menus, ... (and I don't know whether one actually exists). Some examples, what should be explained even for people that know the original Lemmix:
- All options in File-Settings
- There is a unlabeled box under "Index" in the Inspector menu.
- What are "S Val" and "L Val"? What "Reset ID"?
- There is a drop-down menu at the bottom right of the Inspector menu. What does it do?
- System.Dat Editor? Huge pile of options and only some are self-explanatory. For a new user, it is not even clear what this whole editor can be used for! And isn't there a barely visible textbox at the very bottom?
- "Help" does not help, but gives the credits. Perhaps give some in-editor help/explanations here?
- What does "Validate Level" do exactly? How does it fix which issue?
- There are some grey boxes in the lower half of the editor. What are they there for?
- ...
(many of them are rhetorical questions for me, because of dedicated experimentation - so no need to answer them here)

2) Remove "Selection" from the top bar and replace it by "Windows" (or something similar)
I rarely need the "align" function, but frequently want to open the skill window, inspector window, ... So I would prefer moving the "align" functions to the bottom of "Edit" and move all the windows to a separate drop-down menu. Then the "View" menu would be much smaller.
On a related note:
- Why is "Dos Levelpack Editor" under "View" and not under "Tools"?
- Is "Align to grid used by Dos" really needed anymore? You cannot save levels in the old Lemmix format anymore, can you?
- Minor point: The order of the window options and view options does not coincide with the order of the FX-keys. Perhaps they can be ordered within the drop-down menu to reflect the order of the FX-keys (though the pairing between options and FX-keys should be kept).

3) Revamp Skillset window
- Currently some of the less used skills are quite at the top of the window (like disarmer, swimmer and stoner), white important ones are at the bottom. The ordering possibly reflects the ordering in the skill panel later on, but here it is more important to find much-used skills easily.
- The miner is far away from basher/digger and floater/glider could be next to each other as well. You probably intended this window to be read horizontally, but with the clear separation into two colums, I always read it vertically.
- Minor issue: Could you fix the internal order of the boxes. Hitting tab gives a random walk around this window . At least all the boxes with the number of skills should be consecutive when hitting tab.

4) Revamp Gimmick window
- About half of the space is taken up by two gimmicks that are rarely used (and that I did not even know about before seeing them here). This space could be used much better by displaying a short description of the current gimmick. If one selects the clock gimmick or bait-and-switch then it may still display the additional options, but otherwise it is simply uninteresting.
- The drop-down menu to select the gimmick shown only 8 out of 44(?) gimmicks in total. It would be better to show a larger number of gimmicks at once.

...and some more solutions for bsmith and Crane.