Hi Dylan,
Ask any questions you like. There really aren't any secrets among supporters (except perhaps identities). My identity wouldn't be a secret except that my sufferer would freak if my identity was known because that would lead back to hers. I started out very transparent and she did freak...
I think that instead of PM'ing people, I'd post questions anywhere you find your topic of interest. I personally reserve PM'ing for highly personal stuff. I would suggest reading some supporter diaries or searching the supporter diaries on your topics. Then you can ask the supporter about it within their diary. That way others who follow the supporter can chime in with their opinions. If the topic gets too long winded, someone will start an independent thread to keep from hijacking the supporters diary...
Of course, you can always start your own threads (especially your own diary, it helps to feel like we know you). Just make a good effort to get each in the right forum...
Bear