Yes, it will bring the extra options, but the choices between light and dark is what is the point, those are the choices that change the "story" of the instance (example: You need to get to the bridge but you have a fast or slow way, fast by rebooting engineering, therby venting a compartment to space with the last crew stuck in there (dark), or go the long way around and divert power at 3 locations on the deck guarded by enemies, thus saving the engineering crew from venting (light).
If you choose the dark side but the person who won chose light, you will all do light (you do however get the points for the side you chose, in this case dark).
Long story, but if you are into RP even a little that might start to get annoying (especially with kids in your party)