What does that have to do with anything? Some things must be reinstated and I talked to stefan about something like this prior to his thread anyhow... He even said he'd add something similar, alas he hasn't.
And Thym, I'm starting to like your floating point layers thing, as I run out of layers on the level-based layers very quickly. Maybe something like
changeimgvis2 i,layer,sublayer; and the sublayer would determine which image was draw over the others on the same layer... in changeimgvis i,layer; the sublayer would default to 0.