Thanks DanSolo! (Almost)
That fixed the sky problem... Still no gamma control. Can't figure out why...
There are three gamma settings in the cfg (I'm using jk2config.cfg, btw... not the multiplayer config).
seta r_ext_gamma_control "0"
seta r_ignorehwgamma "0"
seta r_gamma "2.511719"
I'm playin' with 'em... But not getting very far... Nice to have a sky though.