http://developer.apple.com/bugreporter/You can use that with a free iPhone developer account. The few I have submitted over the years for OS X usually get decent responses, so it's not going into a black hole.
Yeah, that's about all I can recommend too. The wifi/cell radio are really pretty separate (those with hacked phones can run ifconfig and see) so there is no specific "handoff". Obviously there is some magic at a higher level which decides a network interface has gone away and anything outstanding needs to be retried on the remaining interface... but that's about all I know about the matter
Hugo
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