make the new remove tool also work in masks

For those of us rendering images in 3D, we use a lot of render passes as masks to select, remove etc. If I remove something from the image, but I have an alpha mask (generated from the 3D software before taking it into PS) applied to that layer, I still have the outline of the removed object (removed with PS remove tool) in my alpha mask. Could the Remove Tool also be made to work on masks? 

My current work around is to copy the alpha as a new image layer and just use the remove tool on that, then copy paste it in as a mask again, but since remove tool works fine on black and white images, it would be easier if it just worked directly in masks.