My humble request is for some decorative corpses. It's not uncommon to bump into tortured souls throughout the Doom games, though you can't interact with any of them. Some twitch, but their just background objects like trees are. I think there are a few platform versions (like the PlayStation) that allows players to shoot them to elicit a groan, but that's about it.
You take these poor bums for example:
In Doom RL, they might be cool to generate here and there not only for demonic esthetics, but also to bump up the corpse count on a map.
Good meaty fodder to make blood skulls and the like all the more useful. They may add a ghoulish element of strategy the way exploding barrels do. And that's pretty much it. I hope this isn't too fancy a request.
If this ever is a go, I hope Derek Yu illustrates it. That man is a genius of pixels.