Keyboard shortcuts for non-email operations

I know I can display and modify keyboard shortcuts for various email operations (sending, marking, searching, whatever), but what I’m looking for is the ability to use (create or modify) a shortcut for a non-email operation.  Specifically what I’d like is something that navigates Menu -> Tools -> Rules, so I can get to the Rules dialog quickly.  I’m not really interested in the existing capability to create a rule from the current email address, because what I want to do is add the email address to my existing rule (a “block” list).  

Of course, an option to add the current email address to an existing rule would also be a solution.

There is no shortcut or Rule option to do that.

Just copy the email address, then edit the existing Rule.