Check out this link to a discussion on Asperger's (a form of high-functioning autism). You can PM (send a "private message" to some of the parents who posted on that discussion to discuss some of the questions you have)
http://www.enz.org/forum/showthread....asperger+child
My feeling is, always, on these kinds of questions that come up on this list ("Will they deny based on **fill-in-the-blank condition**?") is that if the candidate is strong, esp if she/he is able to work in an area of long-term skills shortage, and the medical need not on the absolute "we can't accept" list and not requiring long-term regular use of the health care system to care for this need...that, after medical assessors review it, most conditions are a non-issue.
But that's just my sense - I may be way off!