Hi...
Some thoughts maybe to consider? (ArtStudio Pro - iPad)
1) AutoSave pop-up still v. intrusive. Is it not possible perhaps to have option to hide completely?
2) Selection Tool/s: Would it be possible to have the 3 view modes (Marching Ants, Quick Mask, None) available from an Arrow-Up sub-menu on the bottom bar? (Or at least in the Bottom Bar > More menu)?
3) Slight thought: Layer > Enable as Mask would be clearer? (As it is, it might mean: enable a mask to be created for this layer).