Monochrome transform feature request

[johnp]

You can put this request in the crazy (or lazy person) category if you want!

It would be great when I select the Extract Channel mode that there was a way to use the
arrow key to cycle through the choices. I always lake to preview different choices, but
it requires multiple mouse clicks to re-open the choices to click on an option. I would love
to be able to quickly cycle through just be able to quickly preview choices.

Alternately, if there was a way to expose 'radio buttons' in that mode that I could click on,
then click on the next one, etc, that would be fine.

Thanks!

John P