There's b0rsuk's mod posted on vavoom forums:
http://vavoom-engine.com/forums/viewtop ... =10&t=3384

I haven't yet run it but according to descriptions, it has some very interesting ideas.
Do you think any of them fit SE? I personally liked an idea to speed Ettins up and also making Centaurs deflect only direct frontal hits with their shields.

Speeding Ettins up is how real men have played the original Hexen since the 1990s (by choosing highest difficulty level at game start, it speeds up all monsters by 100%).

Maybe if something is neede (or wanted), we could implement them as "variations" for different weapons/monsters .