Re: I can find no information on how to set up keyboard shortcuts that are NOT listed with the defaults. I want to set up luminosity channel mask short cuts and some others.

There are default shortcuts for channel shortcuts that are not listed in Edit>Keyboard shortcuts.

You want to use other keyboard shortcuts than the ones listed here:

Photoshop Help | Default keyboard shortcuts

To load the luminosity of a layer as a selection would be Alt+Ctrl+2 or Option+Command+2