Blend Range preview

[GMPhotography]

I'd like to request a hotkey option in blend range where pressing and holding the hotkey will give you a grey or red mask showing you exactly what areas are coming through/being affected. This would help it in being more exact and blend range would truly become the new luminosity masking. It's only limitation is that you can't physically see what EXACTLY you're affecting. I get the feeling that blend range wants to be a scalpel, but without this option, it's still a bludgeon.  There are workarounds but if it were a hotkey option, it would be so smooth.

Also, as I added in a different feature request, changing from master to Red, Green Or Blue should allow you to control not the colour, but the channel, or maybe put in a channel selector so you can choose the blend of say, a blur filter, to only affect the shadows of the red channel and nothing else. Currently if you adjust green and blue down so it is not affecting those pixels at all, it also still affects the red, and quite significantly at that. There is a workaround to that as well: creating grey-scale images of each of the channels and working on them individually and then rebuilding the colour image, but Blend Range is SO CLOSE to achieving this in one simple step.