I strongly dislike Orig 08 (How much is that doggie) and Orig 16 (Ten Green Bottles / Twang) -- not the tunes themselves but specifically their Lemmings incarnations.

My favourites are Orig 10, Orig 11 (Rondo alla Turca), Orig 15, ONML 1 and ONML 5 (going by NL numbering, which equals DOS numbering for ONML tracks).

Way back in the Cheapo days I had a topic for level records, and two levels stood out for being huge, sprawling levels that took a long time to complete:

"Absolute Ultimate Challenge" by namida, time limit 37:45, my best completion was about 25:00
"The long trek to freedom" by Adam, time limit 39:00, my best completion was about 32:30

Maximum score is basically the same challenge as Minimum skills with maximum saved, so that topic is the first port of call when you want to compare with DOS results. However, for levels requiring 100% (of which Mayhem 6 is one) results were copied from What is the minimum number of skills needed to beat each level?.

Mayhem 6's result was reported in this post, with a replay.

Back home now. Had a great time. A couple of group pictures were taken and should be posted soon.

The meet started a little awkwardly as ∫tan x and I arrived and stood outside WHSmith for a while, both unsure of whether the other was one of the LF crowd but then we both noticed a nearby group of four with a Lemming plushie (although I recognised Flopsy's face before noticing the lemming). WillLem and kingshadow arrived within another five minutes and we decided, as I had scouted the Wetherspoons and it was packed, to head to the Trinity Centre. Flopsy was interested in the Lego store so we called there first, then lunch at a place called the Giraffe that I've been past many times but never tried out. It was a good choice -- I had their all-day breakfast and the sausages were especially good. We got to know each other over lunch and talked about maths, programming, Lemmings, and our various projects (I explained a bit about a DROD project I am currently involved with).

Then we wandered around the town centre, found a couple of interesting places I didn't know about at all (including a board game retreat and a geek store with an even bigger manga selection than Forbidden Planet). The weather had, surprisingly, held out all this time, but it started to rain and we decided to head to Waterstone's bookstore ("backrouting Leeds", as someone described the route we took). We stayed in the cafe there for the rest of the meetup, and pored over the Lemmings: The Ports book and Lemmings adventure gamebooks.

I'm safely home now (thanks to WillLem giving me a lift), and we're just waiting to hear whether everyone else got home safely

I think you're overthinking things a bit. Not all ideas are good, and even good ones may just end up not fitting in.

The Batter as-is and the Grenader as-is are good skills. The question should be "are they improved or worsened by these changes?", not "is this a good place to include the idea of a ranged flinger?" If that leaves us without a ranged flinger then that's okay; if you have a hard limit of 30 skills and already have 25 then you can't fit in everything that gets proposed.

Excellent idea -- and the Lego store is in the Trinity Centre, a huge shopping centre that we could hang out in for a long time, there are lots of options for food.

If they encounter a pickup, the pickup is destroyed and can no longer be collected by another lem.

I hadn't thought of this idea at all, but it's very good!