Hi Wafflejacks,
You cannot get people on the bridge, or anywhere else for that matter, in "Free roaming" mode. The only way to do it is to build a mission and then place the people where you want them. Quite a number of missions do have people on the ships, in some cases standing still and in others moving about the decks. This has been done by the builders of the missions.
If you check this post and the mission editor notes included at the bottom you will find how it is done. A gentle warning:- It is NOT easy to do!
http://forum.shipsim.com/index.php/topic,19793.msg271062.html#msg271062
Regards,
Angus.