Gave up on the custom comments due to lack of support for it via facebook graph api or FQL.
The problem lies in the admin part. I can send a post request to facebook with the admin settings set in PhpBB but if the admin changes the settings from facebook then there is no way to retrieve those settings and every time the custom comments box is loaded will over write those setting unless the admin changes them on PhpBB. So it kills the idea of custom comments. Lets just hope that facebook will support custom css like fb:fan-box does. It's sorta like PhpBB releases 4.0 and you can only use the mods that PhpBB supply with the default style. That's the only sort of comparison I can come up with. I should have scrapped the idea of the custom comments from the start but thought it would be good to offer a custom style so user can change what ever they want to suit there forum/style.
If you would like to see anything else provided/intergrated into FB2011 please leave some suggestions here.
i.e like box for topics or index.php live stream, add friends in profile fields on memberslist/posts, facebook user gallery in profile...... Just some suggestions. If not I can finish the package now and release as beta.