Edit uv coordinates of control points ?

[yatara-visuals]

Hi, first of all, thanks a lot for this work.
I'm trying to adapt it for spherical mirror projection distortion. The only thing I would need for this to work is a way to manually set the uv texture coordinates of individual control points (without moving the control point itself) in a bilinear warp. Any idea how to do this ? I've tried something with warp -> setupControlPoints(); but without luck until now. I have quite a mediocre level in C++ so any pointer would help a lot !