In regards to Dolly Dimple:
While changing the requirements for levels could potentially get out of hand, I think in a few limited cases it could be justified. Assuming the current is 80/80 (Suggestion: Don't say you changed the requirement to X; say you changed the requirement from Y to X; this makes it easier if someone doesn't recall the requirements off the top of their head), 79/80 for Dolly Dimple might not be unreasonable. I think the ONML version is slightly more interesting than the other version, but it is certainly builder-heavy. I don't remember how much extra building that one extra lemming takes to save off the top of my head, though, so I don't know if the 79/80 change would actually solve the problem.
That said, I would propose the following restriction on changes to save requirements (not counting changes made to prevent backroutes):
- Can only make the save requirement looser (e.g. from 80/80 to 79/80 is okay, but from 79/80 to 80/80 is not)
- Should only be done in situations where it is obvious how to save the remaining lemmings but tedious to do so