Hi,
I think you are overthinking this actually. Basically, if your camera behavior is not on your players, have your player fire a global event saying "hello" and pass in its event data a reference to itself, then your camera behavior can get it.
now, you can also have your camera behavior on each player and not active, you can also have one camera per player, and simply have it turned off.
as for not being able to turn an object with playmaker var, I created some more quaternion actions, so you might finally find your missing link there:
https://hutonggames.fogbugz.com/default.asp?W967 I know, the possibilities are overwhelming...
bye,
Jean