Two quick suggestions to improve rotobrush, especially for projects that are using it a lot.
1) Have an indication in the Effects Controls panel to show if the rotobrush has been frozen or not. This makes it easier to see if a layer is frozen without having to open the rotobrush in the layer window
2) Be able to queue up / batch freeze multiple rotobrush layers, preferably in the background. A sort of "render queue" but for rotobrush layers...
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