BfB can be good for OT role yes this is very true. Of that no one should disagree. Besides a DRK is known for taking those big risks and BfB would fit in nicely.

However I don't think Crossclass skills are going to change. I've always kinda hated the fact if they are crossclass then you should be able to choose from any of them. The limitation of 2 specific crossclass trees is quite irritating and limited selection of skills as well.