Re: Toilet lids
It would require some texture edits to remove painted in shadows from the lids, and in a few cases some re-modeling because the lid isn't a separate aspect of the mesh itself. In a few cases the toilets don't even have a lid to close it with, so they would have to be added to them. And in those cases there isn't any room for lids on the texture map, so they'd have to redo the textures and so this quickly becomes a lot of work for such a small visual detail. But those toilets could be left alone with no lid, so maybe in that case it could be do-able. Otherwise this would have to be incorporated into the gameplay design of the toilets from the ground up, which can only happen with a new entry in the series.
It is a detail I would like too, but I'm not sure if it would be worth the effort.