What do you think about adding a third element for each tuple in
rmenu_specs ? This new element would be a string determining the name of
a function that would be called to define the state of each entry in the
right menu. If None is used in place of a string, then it is assumed
that the entry doesn't require such thing.

Attaching a patch that does that. It also adds cut/copy/paste to the
right menu in IDLE shell.