Hi Maciej,
You are right, if we forget to configure a multiplicity attribute, then the following path will execute many times. And this situation is worse than dead wait.
Actually, I like the WHILE node of BPEL. But since I didn't know whether we could use GroupActivity in production environment, I don't want to risk.
Finally, I am agree this feature is very useful. Even if we can't find the best solution, I will also vote yes on it.
Thank you for your great work.