A) The crossing his own timeline thing isn't as big a deal as some are making it out to be. This all took place in the TARDIS, for one. We have no reason to think that paradoxes can't happen inside the TARDIS, particularly "time echoes" created by the TARDIS('s exploding engine) itself. So I'm pretty confident in saying that part is a non-issue. Secondly, even if it was going to fuck up Time, I'm fairly certain the Doctor would cross his own timeline if NOT doing so would cause his death and the destruction of the TARDIS. Worse things would happen if he wasn't around, and he can always try to fix the fuckups later.
B) Clara. That bitch. There's something about her that's off-putting. Can't put my finger on it, but as much as I like to look at her, I feel like she's pretending to be something she's not, a lot of the time. Maybe I'm biased, I dunno. Anyhoo, I think it may end up being really important that she found out the Doctor's name. I know, I know, "that timeline stopped exsisting, dipshit". Well, yeah...and no. Mostly yeah, but that message/button that got tossed through is a piece of that other timeline, and that's probably all Moffet needs to make a connection. I wouldn't be surprised if she starts having visions, or premonitions, or dreams of some sort soon. And on the plains of whatsits where the truth must be told, I bet SHE will provide the answer to she question. The Doctor will probably arrive on the plain, and be like "fuck that, I know what's supposed to happen here. Clara, go check that shit out" and she will and OOPS she knows his name. That's all theory anyways. Honestly, as much as it would be awesome to know the Doctor's name, a huge part of me is resistant. I don't WANT to know. It really IS the central question of the entire series, it's the name of the show, and was before anyone had made a joke of it like it is now. (Doctor what? that will do -bleh). Besides, I still think the Doctor is the Other, and Omega should be the end-all 50th anniversary baddie. Buuut I'm a bit of a nut like that. I know it wasn't me Jait was talking about on the old boards, but I HAVE watched all 800+ episodes, and a handful of the books so....yeah.