Playing JADE gave me an idea about stairs. I noticed it's super annoying trying to find stairs to the next level in those quite large levels (especially maze types). So, why not make it easier and place the stairs somewhere near the entry stairs? It would make navigating much nicer when you have explored that level and just want to pass through it. Someone would argue that it makes too easy to advance, but that's not correct. The level difficulty should be determining that. In other words you can't just rush into places without getting killed by powerful monsters.
JADE is a nice game, because it shows how not to do things. It's constantly reminding what is bad game design.