Hey Igor,
thanks for contacting us
1. It should be... And if something goes wrong I'm always here to help - you can give me access to phpmyadmin and I'll do the migration for you.
2. Yes
3. Yes - moderators get notified on new comments, also users can subscribe to notifications as well (we even have rss )
4. Unfortunately no, but there is a publish/unpublish link for moderators in frontend.
5. Yes you can disable it on categories/article basis. there is also an option to disable further commenting in an article.
6. No, but once you purchase the component you have them in the backend
You can also create your own - a little bit of css knowledge is a must on that.
7. No. We support this option only for akismet. If akismet thinks that the comment is a spam - we unpublish it until a moderator decides otherwise.
Hope that answers everything. If something is still unclear, just shoot
Cheers,
Daniel