The Tavern

Pros:

-Combined with the recent change to make monster derived health bars visible, they wouldn't behave differently from "normal" monsters anymore
-Player deaths increased because you underestimated that undead frog for the last time

Cons:

-They would work differently than player created derived undead which could be misleading. Or downright impossible due to coding restrictions, I wouldn't know about that.

Thoughts, opinions, suggestions?

nah

There's no reason why player-created derived undead can't use stairs anymore since they time out. Just let all derived undead use stairs.

Yred derived undead do not time out.

Make player-animated undead, including Yred ones, actual summons, that way you can make monster derived undead use stairs and player-animated undead still won't be able to use stairs because they're summons.

Really though derived undead aren't interesting as enemies in the first place and should just not generate.

Juggernaught undead were pretty dope in that period of time where slow-fist speed didn't translate across death.

So make them time out when the change to let derived undead use stairs go through. I'm not sure why they don't when Yred gives permanent allies anyways, honestly.