Using 'add fingering' keyboard shortcut

I see that I can use the shortcuts preference to add a shortcut for 'add fingering'. However I don't see how to specify which palette entry should be chosen, nor how to create shortcuts for inserting arbitrary palette entries (which seems like a desirable general-purpose mechanism). I don't see any forum comments on this topic but perhaps I'm missing them. I do see lots of 'insert fret X' etc. shortcut mechanisms so presumably there's a way to add custom shortcuts but I'm not clear about this. Thanks for any suggestions. In exercises and other pedagogical material for guitar, it's often desirable to insert finger and string information on every note. I'd love to be able to do this during note entry.