Hey Mark,
To be honest - I like compojoomComment for k2 much more than the standard k2 comments, hahaha
OK, back to your questions
- yes, you can take the user avatar from k2
- yes, comments can be made only for registered. Furthermore - you can enable the captcha only for unregistered users
This is the way we have it here on compojoom - you can check it out - just go to the blog section and as a registered user you won't see any captcha form, but if you log out - the captcha will be shown
- yes, username and email are filled out automatically for registered users
- yes, you can import the comments from k2 - we have an import screen, there you need to select the k2_comment table, do some field matching and click the import button
Cheers,
Daniel
P.S. And as you know
magazine.joomla.org/
uses K2 and compojoomComment - so the system can't be that bad