Thanks for this great plugin. Two small suggestions:
1) Place the checkbox before the submit button; no form fields should go after a submit button.
2) Plugin creates invalid code, and throws two validation errors which you could fix:
a) Document type does not allow element "input" here; missing one of ... [block level elements]
The input should be wrapped in a
<p> tag, preferably one with a css class so that it can be styled if necessary.
b) Required attribute "type" not specified.
Again, thanks for a great little plugin!