Yes you can edit the shader, but you ll still need a recompile i d say (not that sure about it though).
Of course the FPS are “good”… they always are as long as there s no LIGHT compile done… so actually the FPS u get now aren’t really valid.
Generally releasing maps without a LIGHT compile should be forbidden FFS.
If your compile crashed on it… you are in trouble. Do you have a compile logfile? I could have a look at it. How do you compile? With Radiant (which would be real messy)?
I recommend you get yourself q3map2build by Bobdev, that s a good frontend for compiling. It has the HUGE advantage of using your RAM a lot more efficient, and compiles are a lot faster compared to compiles with the Radiant.