Love your work, this is so useful !!!
I'll allow myself to make a request for a very simple extension :
Adds a tool that allows selecting a layer by just clicking directly on the sprite where there are pixels used by that layer. And if possible, it would also display the name of the layer when you hover the cursor over that layer on the picture. Since it would be a tool, you would be able to just hold the tool button (for instance Ctrl) to make it active.
I know that there is already the auto-select mode for the move tool, but this is too impractical for 2 reasons : it very often accidentally moves the layer instead of just selecting it, and it doesn't tell the name of the layer when you want to select one (which would be useful).