I agree with möbius here that turning every single discussion into a rant calling everything horrible that doesn't confirm to ones preferences is not the right way.
After thinking a bit I've come to a conclusion:I myself am a bit too harsh to the hidden trap topic as well and should simply stick more to criticise and point out where they pop up with no additional rant to decrease the occurances of these. Lemmings is not and should not be the clean as a lab experience in every single aspect -- levels have their edges and corners that not everybody will like. Some tolerate them, some despise them and others like them.
This is the case with big levels, tiny levels, trap levels, levels with decorative objects, glider levels, Hard for Flopsy levels, precise levels.........endless list here. The only variance is that the percentages of people in the three grounps (like, neutral, dislike) shifts. Making the time easier for the ones that despise them (see clear physics) is a good way though. An additional switch to turn off the decorative objects should do the trick. Anymore ranting and raging after that I would call overreacting.
The clean lab....That's what I fear Lix singleplayer has already become with the removal of VRR, timers and the fact that still no music is there. A clean lab that has no roughness and edges and lacks in ambience therefor. Everything scaled down to a tiny clean level with no tolerance for decoration, surrondings and personal notes. Everything that's not 100% confirm with the basic core elements is gone -- this can be a very bad thing.
Maybe this statement should have gone in a new topic of it's own against rants and for living in peace with all the aspects of Lemming level design and celebrate diversity.
But now to the actual topic:I can see animated backgrounds as a possible hassard, but as you already have the ability to turn them off I think allowing them is alright. If you don't like a background turn it off and I will do that as well to the ones that do not live in harmony with terrain and are just a major distraction.
I like the twinkling stars idea as well. But I would like turn sth off like Aty's rain effect he uses on some levels