First off, this is a tremendous plugin and really invaluable. I am going to recommend this as a suggested add-on for my plugin as I think it will really help my users.
Secondly, I'm running 3.1 in debug mode on my development site and am seeing this error message:
Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in /var/www/vhosts/foxy-shop.com/subdomains/dev/httpdocs/wp-includes/functions.php on line 3387
Should be fairly easy to get this cleaned up in the next release. Thanks again for the great plugin!