Make Masking Behavior Consistent with AE

I miss having a garbage matte. I realize that we now have similar tools in the Opacity controls, and in just about every effect that has Opacity controls. But what I don't like about those is that you can't grab a line between two vertices and move it straight or expand it, etc. Is there a way that you could make these masks behave more like the ones in After Effects? I have a hard time trying to get a square box even using the box mask in Opacity. Maybe this is just a lack of user knowledge on my behalf, but it would make sense that they should behave the same as they do in After Effects.  Thanks for hearing me out.