You're talking about a Q/A forum, no discussions. That architecture in a forum would be mindfucking, because it would mess with the post order, so following the thread would be hard.
It's like that on StackOverflow and it's fine when there is one answer per post, but when you want to have a discussion out of that, then it gets mangled.
I say no to that.
True dat... but 4chan manages to do it
Or maybe only allow it with "Question" posts and only the OP can upvote an answer
