RE: Using Futaba 7CAP for a Heli
The software is identical. The throttle ratchet is an easy mod which you will definately want to do, you will find you like the smooth throttle better for airplane flying as well.
The other difference is switch position. On the top of the transmitter the H version has the 3 position switch on the left used for flight modes and the two position on the right used for throttle hold. These switches are reversed on the A version and it will be important to point out to any regular heli flyer assisting you that throttle hold will be on the left.
Other than those minor issues thats it.