I've been using this plugin for quiet some time, and I think it should be updated with more features. The current functionality offered by this plugin aren't fulfilling the required user experience.
Some of the requested features are:
1. Add field for suggested error correction.
2. Add field to submit name and email address to communicate with the person.
3. Option to show alert box, in the bottom or in the middle of page.
I know it consumes a lot of your precious time to code, so I suggest why don't you release a pro version as an update. I would love to buy it :)