Well he was conscise enough while talking about the vector change.
To me it was clear he only acts as a miror, he can change some parameters.
Maybe I was wrong before, to me he only changes directions, but not intensity, energy, velocity.
He can choose any direction, and he set that to reflection as default. He's some kind of universal miror.

I wonder what Imagine Breaker can do with it. What would be an inversion of the Imagine Breaker if we suppose the Imagine Breaker doesn't just anihilate the Vector power. Then what will happen of the power if Touma can actually touch him too... I suppose that would deactivate the power.