I think that's a great idea, but I'm looking for the "right" way to do it.
With DarkPlaces is there a proper way to tell the client via QuakeC to play a "cd track" or music?
The reason that the "cd play xxx" command is the wrong way in my opinion is that direct cd functionality shouldn't even accessible via a mod.
Although I think it would be hilarious for a server admin to have a mod repeatedly send "cd eject" and "cd close" to a troublesome player (LOL

Basically, some commands like "cd <anything>" should be offlimits to the server and the client should ignore such commands. (ProQuake 4, for example, won't act upon a server "unbindall" keys and do that; historically jerk admins would do that people they didn't like and abuse the "profile" command which would crash a client -- referred to as "superkick" in the NQ community -- something of which LordHavoc shared to fix for a couple of years back).