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It would be great to have a checkable, toggle-able option in the tool options (next to "Pixel-perfect") that inverts the index increment direction of the shading ink brush (effectively swapping the right and left mouse buttons with that tool).
The tool is perfectly functional as-is, but it would make tablet life a lot easier, and drawing with the right mouse button held seems clumsier for me than with the left one held.
Just a small thing; thanks for considering it!
Related to #85 item, X key should reverse the gradient.
Switch shading colors with X key
Related to #85 and #854