It would be nice if the 'display monster list' (which lists all the monster that you know of) was sorted by the depth of the monsters, so the the deepest monsters are listed first.
If you cast detection on eg. a large vault, it will show the a couple dozen types of monsters and "...and 98 others."; the player cares about the high level uniques and such, not about the jackals. Currently, it lists all the jackals and small kobolds first (in the same order as monster.txt). It would be nice to see at a glance what the most difficult monster on the screen is.