I fly a Skymaster F16 on tailerons and it is perfect, I can't compare with the aileron elevator version. I did that for two reasons , keep the weight down (saves two servos and linkages) and keep the plane simple to operate (nothing to plug when you bolt the wings).
I don't think one version is better than the other, just a personnal choice I guess.

For the throws you can start with 75% of the elevator travel for the roll function, it works like a delta or a wing so you're right.

Let us know how it goes with the prop F16

Florent