It wuold be very useful to organize in 'folders' or ' sublayers' the Image Layers. Often - explacially in creating shadows, glows, borders, etc - there are many layers to work with. 
In PS this is less usefull because most of the shadows, glows and etc effects are 'in layer' and can be modified just working on each layer parameters.

Also it would be useful to link layes with the chain tool, creating different 'groups of chained layers'. Now we I want to move 2 groups of 3 layer each, togheter I must select and deselect every time the chain of each group, and it's one of those thing I think that is near to people perception of usability :)

thank you for your work!