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It would be very helpful to have the ability to use the numeric keypad (up, down, left, right, etc.) to be able to move the selected way-points (probably 1 pixel at a time).
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It would also be helpful if the editor gave you a zoom control on this window to zoom in for small detail or zoom out for large areas.
I find that using the mouse doesn’t give the needed fine grained control to precisely define the boundaries without having to click multiple times to get it right.