I use the video tutorials plugin on client sites and charge

Hi, I use the video tutorials plugin on client sites and charge a small monthly fee for including them. I think the addition of a setting within the plugin to disable the plugin on a certain date would be very useful. For example if a client has the videos installed and then say 3 months later decides they do not want them, I would cancel their billing and then set the plugin expiration date to the date of the day before their next billing would have taken place. E.g. client billed on 1st of August 2013 cancels on 8th August 2013 - I set the plugin expiration to be 31st August 2013.

Thanks