Yeah... it's 0.1 for a reason ;)
I hadn't actually planned having anything on the /revisions URL, but that's a good idea to show a list of recent edits! (It shows up in Admin>Pages because it's a page plugin, I don't think there is a way to disable it.)
Suggestion 1: I changed the plugin to use Q2A's built-in plugin initialisation instead of my custom thing, so the readme is out of date. There should be a message on the Edit History section on the plugins page but that is missing for some reason.
Suggestion 2: The revisions for each post are linked from the posts themselves. Where you see for example "edited 1 minute ago", the "edited" text links to the post history.
There is a problem with that though - it only works when the text is "edited". If someone retagged a question or selected a best answer, those don't link to the post history. And it also links the "edited" text when no edits have been stored (i.e. posts edited before EH was installed). I will try and figure out a better way to do all that.
Suggestion 3: Sure, I will add an option for who can see the edits. Personally I'm happy for regular users to see it.