Okay, somebody needs to try it with a Bvision. 
BPPC has been tried AFAIK, does not work.
I know it has both 3.1 and 1.3 roms but does it boots 1.3 WB from cf?
Yep, IDE device is in the ACA500 firmware so you're good to go even WB1.3 in KS1.3
Oh and it also supports larger than 4gb CF's if a file system like PFS3/SFS is used
