Instructions (courtesy of Xile):

Ok I got it to work with build 19.

What I had to do was make a copy of paintball2.exe, rename in to Quake2.exe...

And in my config file i had to add
set vid_windowclassname "Quake 2"

You should add it after these lines:
set vid_ref "gl"
set vid_fullscreen "0"
set vid_windowclassname "Quake 2"

I'm probably going to make some kind of prepackaged version of DP so that it won't interfere with peoples original clients. Also, adding binds that work in conjunction with keygrip 2.

-y00tz, attached the install file.

kg2054.zip -- keygrip program
pakexplr.zip -- .pak file editor