Path Autocomplete for Menu Editor

jshabazz asked to have an autocomplete on the menu editor's path fields.

from #653552-3: Community Feedback for Menu Editor (jshabazz).

This module is very useful, would you consider combining it with the Menu Path autocomplete module http://drupal.org/project/mpac I have been using that with the mass content creator module to speed up building out site skeletons, and if we had the autocomplete added to your module it would be a real winner.

from #653552-5: Community Feedback for Menu Editor (donquixote).

I made the autocomplete work on my localhost, but I'm not really happy with it.
Drupal's built-in autocomplete only applies to one input field.

What we want is type the title in the title field with an autocomplete dropdown, but then if I select one of the autocomplete choices, I want the path to be inserted in the path input field, and the title in the title field. Then I want the focus to remain on the title field, so I can adjust the title if needed.

I'll see if it can be done - but it will be more than just the normal autocomplete.