first thanks to you for this plugin :) second I have encountered you use a depreciated version of function has_cap() in your current plugin version while I debugged another plugin.
The message from PHP I get is:
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 WP_PATH/wp-includes/functions.php on line 2923
Nothing extrem important, but not using depreciated functions is always safe for the future. ;)