Love the game BTW but one problem I've found is that switching campaigns is way too complicated.
I mostly play singleplayer cos i can't get online most of the time so the campaigns are great.
Anyway when you start up you can only play through one campaign and there is one more included in the main data pk3 which you can select if you set g_campaign_name to "mappack" instead of just "". Also i've got mappack_r2 and when that is installed it sort of replaces the original "mappack". Anyway to switch between them the easiest way seems to be to move the mappack.pk3 so it loads the included one.
The point is it would be so much easier if:
1. The three campaigns had decent and different names to use for g_campaign_name
2. You could select between them in a nice menu
PS: I'm running Nexuiz 2.4.2