1. There are quite a few advanced roleplayers, though there is a larger amount of casual folks. Still, you shouldn't have too much trouble connecting with the right folks. 1x1 tends to lean towards advanced roleplaying, and there are a good number of advanced roleplayers that frequent that section, so you should still be fine.

2. Generally speaking, the site is very open and very accepting. There's a select few that would be better off... gone, to moderate myself, but in general you should be fine. The most likely issue would be dedication - there's a high apathy rate on this site. 1x1 tends to be better, group roleplays that are smart tend to have the coffin already purchased ;p Massive, flamewar debates are pretty rare in my experience, though I've seen them happen in my time here.

3. Site rules say to keep it out of main topics and I haven't seen an issue with that policy arise. It's definitely on the site and allowed in PM and allowed to be advertised for, but the site is miles away from being from overrun by it. It's more likely to suffer a surprise spambot invasion ;p I haven't seen anyone get banned for it, but then, I haven't seen people make a problem with it either.

As long as you don't use your conditions as a sort of crutch or reason to not improve yourself, I don't care much what you have and I'll work around you with it loosely in my mind. Those who go crazy over it can go sod off, but in some cases they aren't completely in the wrong. You seem fine so I don't think there will be much of a problem with it unless you throw a paragraph into your sig, into your CS/IC posts every time or otherwise make a big deal of it. Overall, shouldn't be an issue.

Any more Q's or clarification needed, I'm open.