I did some further work on the project. I was able to optimize the RGB->YUY2 conversion a bit and the game now renders a bit faster.

More notably it seems it is possible to use basedir option to define the location of the data files and I made a simple launcher, that can be used to tell the game, where they are. The launcher also has options for selecting the map to start from, few resolution options, gamma and sensitivity sliders, options for displaying fps and particles and a difficulty setting.

I tried to make the game automatically save when quitting, and then loading from that point, when next launched, but the normal quake2 save funtion doesn't seem to be doing anything with quetoo. I think I'll try asking the upstream quetoo maintainer about that before wasting any more time with that. Though I won't be having access to my pc during the weekend, so that'll have to wait atleast until monday.

Files again available at http://www2.lut.fi/~thietan1/quetoo/.