Here in the PRC, I suggest that, when in doubt about what behavior is or is not permissible (by rule, not culturally), it is best to just move on ahead and count on someone to say something if you are completely out of line.
As soon as you inquire about the rules (e.g. “am I required to complete any paperwork in my position as visiting faculty?”), you invoke the rules and the notion that they should be applied to your situation. Given that there is no shortage of rules here, just sporadic and capricious application of them, and, furthermore, that everyone is always running the risk of discovery as a violator of some rule or other at the hands of someone or other who has the power to apply the rules, it is really is best just to keep quiet and do what you want (quietly, that is) until you are instructed otherwise.
Just so you know, I did not ask the aforementioned questioned because I know not to reference the rules.