Back to the beginning. I thought the problem is solved but it looks like it isn't. The deployment process works fine except for a birt problem(which is not needed atm) with the current configuration and a vfs problem I don't understand, but I think (or better hope) it has nothing todo with the main problem. (It is the following: http://pastebin.com/tW50KVzE)
The problem now is after logging in to the console after a few moments (it looks like some guvnor initialization) I'm getting an exception for a class (bitronix.tm.TransactionManagerServices) so I've just copied the btm-2.1.2.jar from the runtime directory into WEB-INF/lib of the console server war and the human task war.
This "at least" changes the exception to the following exceptions: http://pastebin.com/Ag4epYY2
Any ideas left? :-/