Verge Premium & Verified Accounts
Just a few ideas...
Verge Premium, a monthly service that helps support the site, removes ads (when you are logged in, of course), and increases your edit time. It would show a thingy on your account that you have a premium account. It would also show an icon next to your comments. See images below
Verified accounts. Similar to Youtube or twitter, where you can get your account verified if you are a "person of importance" other than the staff/ mods. It would show an icon similar to the moderator icon, except say something else..?