how do I do reassignable keybindings for menu items?

Can anyone point me to a faq/post that explains/hints at how to do
reassignable keybindings for menu items (where a user can set a key
binding for a menu item by typing it when the menu item is highlighted).
I've noticed this feature in a number of GNOME programs and would like
to implement it, but haven't been able to find the proper resource.

Also, I'd like to find the right place to report a UI bug with this
feature -- I've noticed that e.g. in epiphany, you can rebind a regular
old key quite by accident with no warning, leading to mistifying
behavior (such as opening new windows when you're trying to type a new
message). I filed a bug with epiphany but they told me it was a problem
elsewhere in the toolkit. Obviously this isn't a pygtk issue, but I
thought I'd mention it, since if you can answer my first question, you
can probably answer this one too :)

Tom
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