I tweaked colours and now they are looking better IMO. I also turned off motion blur, depth of field and bloom.
Don't forget to leave the motion blur, depth of field and bloom settings checked in the game menu. This way the advanced postprocessing does the tweaking for you.
I wonder if to turn on OpenAl, but I don't know what is it.
It is hardware sound, useful for 3d sound effects. If the sounds still work well on your machine and ut3 won't crash depends on your soundcard. With my onboard realtek chip only software sound works fine.
Now I found nice balance between good graphic settings and visibility of enemies, thanks.
No problemo