I'm pretty sure this must be an update or something since the last answer on this post. But I just stumbled across it and used the physics behaviour's enable/disable action. So for anybody, who is looking for the same thing
(having physics behaviour based movement)
Object A should collide with B
Object B should collide with C
but A shouldn't collide with C
Event: "A" is on-screen Action: "A" - disable physics collision with "C"
This object-based disabling wasn't possible back then?
All the best,