I agree with Dolfin.. using the relationships forum would seem one good place to discuss those issues.
General is another. IMO I'm thinking this because ... this is a support site for mental health issues... help me out here ... I don't see being bi-racial falling into that category in itself, any more than being say, Native American & Scottish, or being physically disabled. I can utilize the forums already available to deal with the issues that may be connected to my feelings about them. You might offer your idea directly to Ozzie or DocJohn, though. I can see why you might think another forum might be good, though.