Oops I misread your question, didn't notice the 'shadow' part. Okay now to the interesting part. I have been digging into the sc_lights.c script and noticed some size vars and black bmaps created for the shadows. So I changed them from 256 (fairly small which explains the ugly shadows) to 1024, and get alot sharper shadows BUT the shadows are displaced or something like that and the're weird grayish doubles of all objects beside them . Maybe some value I forgot to change? (sun shadows are off)
. Maybe some value I forgot to change? 
