As all of us here know SO itself incorporates all kind of programming questions. But later different sites have emerged with aims on different particular branches related to programming and to a certain depth. Now my question is can the OP ask the moderators after asking his question in a not-so-fit-site to migrate his own question to a different better-fit site for a better answer or for whatever the reason might be? I know the process of migration and voting etc. but when the OP himself intends to, should not it be done in no time? Like, after an OP asks a unix question in SO, he can think to migrate it to unix.SO and his request should not be turned down as he himself asked the question!
Example- I asked a question in SO and just today I discovered there is a computer science SO and according to me, the question should be migrated there. Now my request is not invalid IMHO. So I think when I myself request for it, it should be done.