I think you should be fine on the enrollment. As for the bitcoin address, Stunna made it mandatory that you put it in your profile, I think he said it was because there were too many PMs, and I don't think he always scrolls through all these pages of posts
That is not the address I want associated with my whole account though, only for this sig campaign. I haven't had a linked address since 2011, and I never intended on putting one.
Once I add the address to my profile, is it possible to change or delete it later?