First of all the show guide option of the latest release changes my life, thanks!
Few ideas to be implemented if possible:
In the edit window, a magnetise corner option triggered with alt clic would be a massive win of time.
And/or being able to display and edit X,Y coordonates for each point of masks would be great to ensure things are aligned.
edit window, when creating a shape folder with masks, being able to move it within a new shape folder without breaking display.
In the texture edit window, being able to copy the selected area from a layer and paste it on another one.