1. Add mod to all forums / selected forums with certain permissions instantly instead of the default one mod per forum at a time. I do not mean super moderator. As far as I see, that enables functions that I do not want to enable by default.

2. CBOX shoutbox integration with vbulletin
http://cbox.ws

3. Private Message Scan by keywords / automatic notification
scan selected members' outgoing/incoming private messages for selected keywords, then send a notification to myself via pm if certain keywords are found in the pm's. The purpose it to filter out gossip from my site.

note: forum rules makes it clear that private messages are in fact monitored every now and then

4. Text size options such as the one found here on top right
http://www.spamcop.net/

5. Report abuse button for private messages (same feature / icon on threads' posts)

6. End user private message user list. Purpose: drop down list of all members that are in the "sent" message folder to filter out all sent messages for that particular member.

I'm actually working on a mod very similar to your #3 (only difference is is that mine send an email and adds a notification in the admincp), I'm almost done with it.

up please