Manipulating a points of a mask on an effect in Premiere Pro is a pain in the butt, especially compared to After Effects. It's very difficult to accurately grab a point and simply move it to a different position. I invariably end up adding another point or pulling the bezier curve instead of just repositioning the point. I ask that the Premiere team open up After Effects to notice how much easier it is to adjust the points on a mask. Ask the After Effects team how they do it and just copy what they do. One of the biggest frustrations of all Adobe products is how inconsistent tool behavior is from program to program.