in a way yes, you can change between accounts, when you exit to the main screen in FL, alt tab to the launchpad, doubleclick on the other accounts, that makes it "active" alt tab back to fl, and click multiplayer and THAT account will be active and you should ses you chars
but does it provide the current info for the Discovery Freelancer Conquest listing of jumpholes? I was in the area where the FL companion shows the Leeds jumphole in Magellan and it did not show up.
I think you need to import stuff from a running game. Some objects are above/below plane - something FL companion does not show. One such example was the shipyard in Cassini. Dunno if it's the same now.