So basically, after searching hours and hours for the right plugin to manage posts by guest contributors I came upon your plugin.
It does what it should... almost!
I set the default post status as pending review and it doesn't publish anything until I confirm them BUT after setting the status to published, the contributor can edit it as much as he/she likes.
Doesn't this beat the purpose? Is there any way I can have all the posts revert to pending once they're edit by contributors?