[Feature Request/Discussion] Include previewing RGBA channels?

[tomasvy]

Just a small suggestion that would make this tool very useful for texture artists.
in form of toggleable buttons for each channel.
maybe like the screenshot below, but you can press multiple channels to preview them all together or separately.

also a small hotkey to cycle through channels would be pretty neat.
what do you think?

[Tom94]

tev now has the hotkey X to explode grouped channels into individual ones -- this'll let you cycle by using left/right arrows.