P:(Masking) Draw masking as a rectangle

[C__D]

To be able to draw masking as a rectangle and then pick each corner of the shape to scale/ change it would make masking that much easier.

[Akasta]

Sometimes we need to mask a screen, a window, or something else that is square or rectangular. It would be helpful to have square masking options in addition to the round ones. What would also be nice to have is a type of rectangular mask that allows dragging its corners freely to reach straight-lined shapes like triangles and trapeziums.