I have a proxy that changes my IP address. Should I avoid using it while on Subeta so I don't get accused of having multiple accounts?

This is something you should definitely file a ticket about. A UA could help you more with this question than a user could. :3

Oh I never know where to go with these silly inquiries. xD Ah well, off to the ticket centre I go!

You can have them make a note I think. HOWEVER if you're having trouble with being logged out or something, if you un-check the "enhanced security login" thing at login, you shouldn't have any trouble.