I was going to point out that you don't have , but I guess that's Multiplayer only. My memories of single player are from my weapon monsters mod I guess.

A mods repository would be very cool as well, though given the amount of work you put into maps I can see it being a troubling headache for whoever takes it on.
The one bug I've encountered is that DP doesn't launch when I hit play. I have to click on Configuration->Engine Configuration before it launches... and sometimes not even that works. If I press play again thinking I mispressed it last time, it can launch quake twice -- one as original quake and the other as darkplaces.
I wonder why. O_o
Beyond that, it's a very cool app!