Is it possible to move sprites from one place to another within a room in the editor?

You can select sprites with the selection box just like you can with tiles, and then move them. It's sometimes hard to tell exactly how large a sprite is, though. You often have to select a much bigger area around the sprite than you'd think. Switches are wider and taller than they look, apparently. And then you have to be careful that you don't mess up your tiles. I usually switch to layer 5 when I move sprites around, and hope that I don't have to fix any ladders.

Is that helpful? I'm not quite sure I'm answering the right question.

Since my own mansions are allergic for backgrounds , I can often do it in layer zero.