UBB.threads PHP Forum Software Community Forums Resources and Customizing How Do I? User Flood Check

Control Panel > Permissions > Group
Select the "Users" group > Forum

Minimum time between posts = 120 (2 minutes)
Delete post time limit = 0 (Never allow)
Edit post time limit = 600 (10 minutes)

You could also create a new group for people like him, and set his posts to:
All new posts are moderated = 1 (true/yes)

Just a few ideas