Expanded support for functions in navigation menus (w/ patch)

[Kris Wong]

> Could you also look into integrating a shortcut for both "actions"

The problem is the "actions" aren't created until the user actually
right clicks to get a context menu.  This would be possible, but it
would require mock actions that calculated the necessary information
based on cursor postion and then called the normal action handlers.

Kris Wong