1) Yes. How? By doing it
2) Yes, by doing it.
Again, sorry to be so short in my comments, but the 'how' is normally shown in a proof of concept by companies. Believe me, it is as simple as using some small java code to call your rules. In jBPM 4.2 most likely a 'rules' node will be implemented making it even simpler.
Even though I was able to get the info tht it can be done,I was not able to find enough information on how it can be done? That is why i posted this ques.
So If u have info kindly share it.