Panning passed the border when zoomed-in
Gimp has this feature, so I'll try to use it as an example:
1. Load an image in gimp
2. Zoom to 400%
3. Use the middle mouse button an pan the image so you can see the borders
In gimp you can see empty space next to the borders/edges of the image.
In DT you can't - the panning stops when the border of the image reaches the border of the view-port/control.
This is very limiting when I'm editing a mask that has control points outside of the image.