Allows anyone editing a published page or post to draft changes before those modifications go public.
The best place to seek support is in the official WordPress support forums. If you don't get an answer there, you can try posting a comment on the official plugin page. Finally, you can hit me up on Twitter if you want me to take a look at something.
You can specify one or more email addresses on a site by visiting the Settings -> Writing screen, or set them at the network level (in multisite) by visiting the Settings -> Network Settings screen.
Email addresses are used with the following priority (higher items on the list overriding all instances of items lower on the list): 1. Email address(es) entered in the box within the "Publish" metabox on the post/page edit screen 2. "dpn_reviewers" option set in the options table 3. "dpn_reviewers" option set in the sitemeta table 4. Admin email address set within Site Admin -> Settings
Yes. It can be activated normally on each individual site or it can be network-activated.
Yes. However, at this time, there are no action links to automatically activate it on all networks at once. Instead, it will have to be network-activated on each individual network (as desired).