Jonathan,
No and no... unfortunately. First, no, there's not a checkbox for posting to the wall. That would actually require changes to JomSocial as it would have to process that checkbox for us since it uses AJAX calls for the post. It is something that I've taken a note to look into though, but want to set expectations low, just in case it's not possible.
As for other features, the idea is to add more, but currently the posts are it. We just got the 4.2.4 release of JFBConnect out with mostly bug-fixes. Now, we're planning to look into some new features, and some of those will definitely focus on JomSocial as that's what a good % of our users use for community software. We already had a request to support pushing images (and other rich content) from status posts to the users wall. Right now, we only do text. If we implement that, it's just a hop and a skip to doing rich content from other area.
If you have specifics on what images you'd like posted (are you just saying any that are added to a user's gallery), or the 'other items' you mention, let us know!
Thanks,
Alex