If you can setup 2 servo ailerons using a y-harness, and without endpoint adjustment, you sure as heck can do the same with a two channel setup. Far too often people think that because the computer radio lets one do something, that they must do it. Spend the time getting the control right mechanically. Endpoint adjustments should be used as a last resort for small fine tuning or in case there's a mechanical issue that prevents using the full range of the servo. The only thing that I've found takes longer when setting up up two channel ailerons is to learn or remember how to do the radio programming.