Anchors support for masks.
Display objects have properties like .maskX, .maskY, .maskScaleX, .maskScaleY and .maskRotation.
And currently masks are center positioned. However sometimes we really need support for anchors as well: .maskAnchorX, .maskAnchorY.
Moreover it would be much more elegant if mask properties were a subtable of a display object.
image.mask.x = 0
image.mask.anchorX = 1
image.mask.scaleX or xScale = 2
See my pro tip on dynamic masks where it would be useful
Albert Pucciani commented
I second this idea. It would also be nice if we had access to the RectPath similar to display.newImageRect() so we could deform the mask as well.