Feedback is incredibily useful for us both for new ideas and for fixing bugs that might have slipped into the development of the exisiting packs/webpages. The VanillaTweaks will be notified of whatever you submit. Adding an email allows us to contact you if something isn't clear or to thank you! Keep in mind that we might not be able to respond to all feedback, as it can be quite busy at times.
We'd love to hear from you though!