Frontend Widget/nav/results showing ACL info

I’d be intrerested to have a widget that displays the groups and users (configurable?) that currently have access to the current page/post.
In particular, I would be fine by knowing READ/EDIT rights (color coded).

Background is, that me as the main administrator want to see, who has access to what content.

Additionally, I would like to mark pages in the menu with either own color settings or dots before text if they can be READ by the current user.
The same of course for any lists (categories showing posts or search or even pages thru a shortcode)

I am happy to develop myself if you can give me some hints how to get the right filters and classes.

Thanks

http://wordpress.org/plugins/advanced-access-manager/