I don't know how other people use the editor, or if there's a better way, but, I find it rather difficult to align pits and stairs. I've always found the best way is to quickly press the stairs button to go to a new level, and then slide my mouse pointer over the pit, so it's in the right place when the new level comes up.
Unfortunately, on my new PC, which is a lot faster, this is harder to do!
So, what I'm asking for, is if the editor could wait ten seconds if one shift-clicks, or right-clicks, or whatever, the stairs up or stairs down buttons.
