Paul,
Apologies for the delay in getting back to this! We haven't been able to look into this yet as we were getting a new release of JFBConnect and JLinked out with some bug fixes that were important (nothing security related, but still worth the upgrade). Now that the releases are out, we're planning to circle back to some feature requests that have been asked for. This is one of them that we'll be looking into (hopefully) over the next few days. It may take a week or so to get an answer and update out though, if we can do what you're looking for.
It should be possible from what we know of the Facebook side, but just need to make sure that JomSocial passes the info we need as well.
Thanks again for your feedback,
Alex