Rendering lightmaps takes a very long time, like a whole evening if you were lightmapping an entire level. The testers would rather spend the time trying to find bugs than render screenshots.
DBPro has hardware shadows but they suck - so I doubt they'd be added to FPSC in their current state, plain shadows should be possible, but they're hellish for ground details and stairs, perhaps they'll make a return in some form though.
Static shadows can always be added manually, a plain with a shadow texture is not rocket science.
Van-B
It's c**p being the only coder in the village.