I'm not sure where i would post this. Since it would help of development in some aspect...
Here is a mod for quake 3, AN SINGLE PLAYER MOD "gasp" that worked fine with an earlier version of open arena. "the one that was release on 6-6-2006, nice release date".
http://tdc.planetquake.gamespy.com/The mod itself made a full working demo, complete with working NPCs "the NPCs where not the smartest, but they where rather good for something made from scratch for free" and multiple map. It even had a story
.
They guy even release the code for the mod for anyone else who wanted to try. Which would be nice.