I might have let things go too far in my greed, you see...
We picked up an NPC some time back, who's been helpful so far, but I'm leery of powerful AND helpful NPC's, they have a habit of becoming powerful enemies sooner or later. So I'm thinking of choosing "Sooner" and have been idly thinking of ways of getting rid of them, after I rather foolishly let them entrench themselves on my ship with a little private workshop (to be fair, they had cool stuff and I figured it'd be easier to get them to make me copies, than to steal it...). But as they increase in power, and collect more and more volatile objects for their work, I'm growing concerned that taking them on board might eventually cost me much more than their value (like, if someone comes to kill them). I already have enough enemies of my own, trying to lay my ship to waste, I don't need someone else's joining the 'fun'.
I don't want to vent the deck's atmosphere in to space suddenly, or pilot a starship in to a star (though those aren't of the table as of yet), but I'm fairly certain asking him to leave, or trying to use traditional methods of force, will cause a lot of collateral damage to me and my ship. Not to mention that he might have trapped the hell out of his workshop.
So I need to begin making long term plans, and I think best when stealing other's ideas (kidding), and was wondering how other Rogue Traders have handled similar problems of unwanted and dangerous people on your ship?