Hey Alex,
1. Yes, you can hide the website field
2. Yes, you can import JAcomment - there is no "script" that has the predifined fields, but you can always map the fields for the import. So basically in the backend you will select the jacomment table and then match the id, title, text etc to the fields in our component. Very easy and you will have it in like 5mins. (if you don't manage to do it, I'm here to help with the import).
3. No currently you can preview only this template. I know that our templates are not that good right now, but we will change this with version 5
. Also you can modify the css to suit your needs
Cheers,
Daniel