I disagree. I built my Mid-star with only one servo because I only had a 4 channel, non-computer radio at the time. But I later got a computer radio and regretted NOT putting servos in the wings.

It doesn't add that much weight or battery drain and does improve responsivness, reduces chance for flutter, opens up options for the future, etc..

BTW, either way it is a great flying plane. If you do go with only one servo, make sure that control rod is glued into the aileron well. I have seen quite a few setups done this way work themselves loose over time.