Yes, it is for speedy processing that it would be nice to be able to have another Editor Hot Key.
I've recently had to abandon my old workflow (because Capture NX2 is going away soon) in favor of a new one which unfortunately requires use of two different converters/editors - such that I cannot send a completed foto from one onward to the other. So after returning a saved TIFF from the first editor to Photo Mechanic, it sure would be cool to immediately Hot Key it to the other editor.
From my former software days, I know that it is not terribly difficult to define such things. But of course the developers have to weigh priorities and demands for more important features.
Cheers - Andrea B.
UltravioletPhotography.com