That feature was removed in JFBConnect v5.1.0. Above the Wall Posts configuration area in previous releases was a note about it's upcoming removal as well.
When Open Graph Actions were introduced by Facebook late last year, they updated their Application Policies to no longer allow automatic posting status updates on a user's behalf without notifying them first and letting them edit that message. The feature we had violated those policies and so it's been removed to protect our users from having their Applications disabled by Facebook.
Facebook recommends using Open Graph Actions now to post to a user's Timeline. Actions are more socially relevant and generally higher quality than the status updates.
I hope that makes sense, but if you have any questions, just let me know.
Thanks,
Alex