The rules state you can make role-play demands. Telling him to enter a certain area is a role-play demand.
So you can do it. If he doesn't comply, then you can shoot him. Just make it possible for him to make it out intact if he complys.
On a related note, I was thinking about forcing a transport to deliver his goods to my pirate base. A friend in a heavy lifter would be on standby in case the trader is hostile to my faction and cannot dock. We get the supplies, he gets the cash for selling it. Win-Win
