1: Last time this year... STFF, Look at the sourcecode.....
2: Depends on your requirements, probably not
3: by doing it
jBPM is a business process management engine. Not a RAD suite.
if you are looking that uses jBPM to help drive some RAD, one of the more promising ones is at:
But, it's not a commercial, buy this and magically gets everything working for you solution...instead, just purchase professional services from some place ;-)