How to add new keyboard shortcuts

Hi,

Is there any documentation on how to add additional keyboard shortcuts to RT. The new theme is nice, but several of the links are now buried in sub-menus instead of being at the top level previously. This could be remedied with some additional shortcuts:

Show Results -> s
First result -> f
Last result -> l
Previous result -> p
Next result -> n

Thank you for any pointers.

Regards,
Ken