Hotkey to Invert Greyscale Paint Value

[Dennis.Porter.3d]

I often use fill layers and paint on masks.  In Photoshop, I can toggle between black/white with the X key which allows me to keep painting without having to stop to adjust my value.  It would be great if you could implement something like this in Painter!

[mario.baldi]

+1
I was just going to post the same request.
A simple thing like this speed up the painting of masks of 10000%.