To Answer your question the url you'd be using in the actions menu is for Member Guestbook:

guestbook.php?owner={profileID}

I know you know how to do the whole line. It looks like you accidentally used the one for "My Guestbook". It happens.

For your last question, don't forget to create the appropriate new tables in the DB and also the rewrite commands in the .htaccess file

RewriteRule ^forum/groups/(.*)$ modules/boonex/forum/$1?orca_integration=groups [QSA,L]


That see more looks like it's the only reference to groups at all in the .htacess