Sorry, I guess that doesn't work either. Doh!
I've found that the /c- option does work when you provide it directly to MPASMWIN.EXE. But it doesn't seem to be passed on by PBPW.
You might be able to create a batch file to do the compiling. Or use MPLAB instead of CDlite. But you'll need to install the PicBasic Interface to MPLAB. It's on the meLabs website as I recall, been awhile since I did that.
http://www.melabs.com/support/mplab.htm
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