No there isn't - and trying to add it would make administration a complete nightmare so its very unlikely to come in a future release
The targets are set at a blog user level - so it sounds like all your contributors are logging into the blog as the same person.
So there are some options here - use a different blog account for the "boss" and then use a different FB account on the "employees" blog login that doesn't have access to the boss's personal blog page. This would mean setting other FB accounts up as administrators of the company FB page.
or you could set up a different blog login for the "employees" and then using the "boss" blog login set the Wordbooker options to only post as the "Boss" blog login (not current user). Set the "allow non wordbooker users to post" and optionally give them the ability to chose to post or not. THEN set, at the user level, the default target so its NOT the personal wall but is instead the chosen company page. That way ANY blog user can publish to your blog and to FB but they can't chose the target. Then when the "boss" wants to post he can change the target wall on the individual post.