No problem at all, just use a good quality hi-torque servo... I have had several 33% models with one servo in each wing. It also is dependent on the use. If you intend to make the ailerons larger and beat the model up for 3D a second servo is a viable consideration, but again it is not required. Were presently flying a AW 33% 540T with a DA100, one servo per wing, 3D abuse at 25lbs. flying weight less fuel.
Have Fun