Re: C-l while in menu?

[Richard Stallman]

    -- otherwise, you can use the standard alt/meta key -- meta+any 
    accelerator letter selects a menu, otherwise you get the regular 
    behavior.  for any shadowed binding, meta+shift+letter ignores the 
    accelerator and gets you the shadowed binding [or alternatively, use 
    esc+letter, which also ignores the accelerator].

I don't think that accelerators should ever shadow standard Emacs keys
such as M-f, M-e, M-b, M-t, M-h, and M-m by default in any X
configuration.  We have to find some other default bindings.  Perhaps
M-Shift- characters should be the default menu accelerators.