Thunderbird (or generic) hotkeys?

[Les Mikesell]

I'm using thunderbird email mostly because it works the same across 
Linux, windows and mac versions and I can alternate platforms accessing 
the same set of IMAP mailboxes easily.  However I miss one thing from 
Evolution - the ability to jump between reverse timestamp sorting (my 
usual reading mode) to a threaded view and back with hotkeys. On the Mac 
I was able to add hotkeys to the view/sort/threaded and unthreaded menu 
options with the generic system keyboard setup which can handle 
application specific mappings.  Does anyone know how to accomplish this 
on the Linux or windows versions?

-- 
   Les Mikesell
    lesmikesell at gmail.com