Many thanks for the responses!

Maybe we could implement this in stages.

We could start off with a checkpoint system. The game state could auto-save at some arbitrary interval (15 seconds?). 'Rewinding' would then simply jump back to the most recent checkpoint.

If we can get this working, there may be the possibility of then utilising the checkpoints as places to jump forward from to reach a particular frame, similar to NeoLemmix's savestate-based framestepping system.

To be clear though: such a measure would be used as the basis of a fast-rewind control rather than a backwards framestepping system, which I do not want to add to RetroLemmini (for the reasons given in the OP). The goal here is simply to make it quicker for the player to move back to some point in the level before a mistake was made, not to grant fine-tuning control over the replay.

Also, this is a long-term goal. There are a few other things that need to be sorted out in RetroLemmini before we can get to this.

It's good to have the feedback, though. Thanks again

Implemented in NLCEPlayer commit 3489449.

'Nudge Viewport' hotkeys can nudge the minimap view up, down, left and right by a user-specified number of pixels.  This can be set up in Hotkey Configuration.

If I'm able to get my passport sorted out, I'd love to make holiday arrangements to spend a week in Germany. Flopsy and I have had a little talk about it in PM. 

I'd be happy to meet up if I'm around at the time.

So far though, I expect that I won't be in Europe between mid-October and the end of March.
I think from May onwards would be the best bet for me.

Happy to have you here!

-- Simon

Sounds interesting. I'm really thinking about it - Kassel is not THAT far away from the city I live in.

dang, I really picked the wrong starting location!  
Hope you have a good time..

@kaywhyn
I only caught a fraction of the whole series, but I very much enjoyed watching it!  It also made me think about the Lemmings 2 the tribe differently... Looks like there's still so much potential waiting to be discovered...

As the topic states, while converting my SEB Lems levels, this has been a grappling problem for the last few levels I've made. While it doesn't affect playability, it's more about how it looks. There is no option to disable the allow one way on the steel pieces, it is greyed out on steel.

This happens on the player if added as an external level and when pressing play level on the editor which I assume are the same player anyway.

Me too, I'm happy with the proposed idea we discussed on the Lix IRC. I'm happy to travel to Germany for this meet up.

Might need to invest in a new laptop before then if working on Lemmings projects side by side is going to be a thing though