At the moment, the separations preview has the ability to toggle ON an individual channel by using a keyboard shortcut e.g. viewing the Cyan channel only can be done by going cmd + opt + shift + 1. Similar shortcuts can be used for the M Y & K channels as well as 5 spot channels, and all 4 process channels at once. However, they only toggle the separation ON. What would be preferable would be the ability to toggle a channel OFF.

Here is a use-case: I'm a finished artist inspecting a magazine layout from my designer. They have used thin tinted black type over coloured areas and these will be an issue later. However to see this I have to - using my mouse - toggle the black eyeball on and off of the black separation to see where the white knockout of this light type would be. A preference would be to have a keyboard shortcut to toggle the visibility of the black channel only on and off, while keeping the other channels visible.