Or, just make the inheritance of the saved 6 view a global function to TR for all TR axis modes. After all we don't have rear view mirrors in planes that were the only way to see a 6 view of any kind. That would still leave the D11, Hurri, F4f4\FM2, F6 and C.202\5 out in the cold.
Unless with AH3, everyone will now have powerful enough systems in general that a rear view mirror view will not be an aid to those with deep pockets and an FPS killer to WalMart specials.