Normally I would agree with Sarah but in my experience events happened that it turned out to be handy to have told the school, such as with restrooms and other things.
You don't have to tell your professors, in fact depending on the professor I would advise against it. But a lot of people wrongly or rightly consider ->-bleeped-<- against the 'rules'. Bathrooms for me was a major point of contention with arguments against me like 'the sound of me peeing would tip the other women off'. (No joke, that was what the vice president of the school told me.) At one point I was forced to use unisex bathrooms of which there were only 6 on the entire campus. That was fun times.
If you know the rules, if there are any, then you would be better able to handle any difficulties. Trust me, getting blindsided by stuff is not fun, and as you probably know by now Shanetastic the college level is still pretty political. If anyone is to know what these rules and policies are it would be the dean of students as they handle student affairs the most. They also would know who to talk to to find out the rules if they don't know. If there simply isn't, as it was in my school, they might set up a meeting to discuss how to handle the situation. In my case I was able to state my case and as well my opinion on how certain things should be handled, some of which is now policy.
As for documents and what professors see on their roll call and such, talking to the registry is the route I would take. They might be able to keep your records 'legal' while giving the professor the information you would like them to see. I know they can do it for nicknames at my school, but I never tried for a full name for various reasons.
Anyways, just my 2 cents.
