O ya we nead more US plane's...why?
But seriously, you forgot the Ki 102, a much better Japanese twin than the Ki 45, it had a 57mm cannon standard.
I think the reasion we have no TU-2 is the same reasion we have no rear gun sight for the Arado, the TU-2 had a rear firing MG in a ventral position that used a perescope as a sight, they can't seam to get that to work, or so I herd through the grape vien, I may be all wet but it seams a reasionable gues. I would realy like to see that plane added.