Not sure if there are any plans for Photoshop-like layer masks in ArtRage so I'd like to offer this suggestion - add a Mask stencil type in addition to Stencil, Ruler, Guide. It would behave as a mask rather than a stencil where white reveals and black conceals (as well as the entire gray-scale spectrum). This would offer a non-destructive form of editing. The mask would apply to either a single layer or a layer group. An icon on the layer palette would indicate the presence of a mask as well as toggle the mask to be visible or the layer with the mask effect to be visible.