The refueling in air is a nice idea. Good positions are either for practicing near San Diego and Pearl Harbor - or in the middle of the Pacific for the transfer from e.g. San Diego to Hawaii (whether someone flies that in the sim?).
Anyway, now you would have to be able to have an identifier fly with you to find the target as well. I have already tried to simulate refueling with the simulated traffic machines in Hawaii - it was a disaster.