Hawk,
You're misreading your manual.

BASIC setup, aileron is 1. this is for ANY model, aileron is always channel 1 for FUTABA.

Now.....USING AILERON DIFFERENTIAL *AND* a 5 channel receiver, the 2nd aileron goes on 5, and you have to change AIL2 to 5&6. ail. diff and a 6+ ch receiver, the second aileron goes in channel 7.

using flaperons with a 6+ channel recever, the second servo goes on channel 6; with a 5 channel, it goes on 5 and you have to change AIL2 to 5&6.

and so on.