set matte should have the option to fit composition or layer
actually it fits the layer size and stretch the Matte layer.
So if we use a layer with a different ratio in the composition it not useful.
With this option, it would have the ability to ignore transformation like rotation size and position... so the Set Matte would work as a Track Matte Layer and we could animate behind it.
It would safe a lot of layer count and space.
Travis Schmidt commented
Right, like if Set Matte had a checkbox that makes it function the same way the trackmatte layer parameter does. I don't want to have to clone my main matte a million times if there are multiple layers that use the same matte