Special hotkeys on menus?

Hi all,

I'm making a very keyboard centric ctwm setup. For instance,
Shift+Ctrl+comma brings up the main menu. 

Ctwm Menus can be navigated with the arrow keys, but the arrow keys
require the user to move his fingers off of home key typing position.
What I'd like to do is, in the context of a menu, have Shift+Ctrl+k and
Shift+Ctrl+j go up one selection and down one selection, respectively.

I saw contexts for "all", and window, and icon, but I saw no context
specifically for being in a menu. Is there such a context?

Also, is there a function to move the selection one up or one down on
the menu?

Thanks

SteveT

Steve Litt
September 2017 featured book: Manager's Guide to Technical
Troubleshooting Brand new, second edition
http://www.troubleshooters.com/mgr