A new type of machine gun that regenerates it's own ammo... This would eliminate the need for ammo crates in MP maps, and the hunting of ammo in SP maps.
It would have two kinds of shooting, the first being the machine gun the second being a detector that you shoot and it'll tell you if there's any enemies in the next room.. but it would only last for about 10 seconds
Also
A new kind of NPC, It would be a ghost basically. On SP maps, it would randomly walk around hunting the player down. Once it finds the player, it would then either attack him/her or simply drain all their bio-energy. It would have the option of being killable or not (The mapper could decide that depending on what he wants to do with the NPC.) It would also contain the ability to go through walls (But would also be optional.)
I thought this would be kinda cool for [A] to do since I don't think there's anything like this in dx.. Let me know what you guys think. T