At the very least, I think Arch-Viles should stop leaving corpses. It didn't matter in Doom 2, because the level layouts were designed so that AVs wouldn't get close enough to others' corpses to cause problems. The kind of AV res-chaining that can go on in DoomRL if you get 3 or 4 of them in a level is definitely not Doomish IMO since it basically requires you to run to the next level or die.
As for the Mortuary, I never went there except on Easy anyway, and post-0.9.8.7 I never went there at all. So, this is just one more nail in the coffin of me taking on the Mortuary I guess. :-P