When using masks it can become frustrating to manipulate individual mask points when you begin to move the adjustment handles instead of the mask point itself. It's almost impossible to select the little point you want to move without mistakenly moving something else. Zooming in helps a lot to a point, but when points are very close to each other it can be difficult to navigate it. Rotoscoping is super time consuming, and I think adding some kind of indication of what you're moving will save some time.