Yes, I have been experimenting with using the ailerons to assist in both glide trim and pitch control. Anytime you push the speed limits of a flight control system you’re flirting with flutter. One way to reduce this risk is to minimize the size of the surface. This works well but it can lead to insufficient control at low speed.
The tail of the X-2 is small and thin; I want to be able to off load some of the force to the larger and thicker wing. Right now the plan is to use the ailerons for glide trim and reserve the elevator for pitch changes. By doing this the setup is 0-0 on boost and the reflex in the ailerons for glide will also help reduce tip stall during landing.