Firstly. Very Nice plugin, until I found this I almost built something almost identical to this.
I have only one concern with the plugin, I plan to use this on several live sites for my clients getting a lot of traffic and want to know if it's compatible with the latest version of WordPress (currently 3.4.1) on face value the plugins directory states it's only compatible up to 3.3.2. If you don't know I would be willing to help test, donate towards making it compatible and also contribute If you want help.
If one of the plugin authors would respond I would appreciate it.
Let me know.