Wow, very cool source port! I will definitely be using this from now on, as it's a great way to play boom wads in multiplayer to do tricks like glides and keybumps and whatnot. It's a bit esoteric, but it would be pretty cool/funny if it were possible to set a -speed for slowmotion in multiplayer lol. Also, an option an enable cheats in multiplayer would be pretty nice, especially resurrect...
One small thing I've noticed is that the wrong music plays on certain maps. For example, pl2 map27 will play the stock Plutonia map27 music (unless pl2.deh is also loaded), though most of the other custom tracks seem to play fine. Crispy Doom, or any other port I've ever used, doesn't have that issue.