There are different "levels" so to speak for come alongs. The idea is to entice the person to move not force him. If that doesn't work you can escalate the technique (mainly simple adding pressure, or twisting a certain way)to make him move if he wants to or not. These are more 'policing' skills than done for a full on confrintation.
From my experience, standing joint locks for controlling someone really only work on people who don't want to fight back, are much weaker than you, or are too drunk to do anything about it. For controlling a person really fighting to get away they are pretty low percentage unless done to perfection. Even ignoring the basic fact that getting solid control of a person's joint while both of you are standing and resisting is hard, the person has too much of their body left out of your control (i.e. all the other parts connected to the wrist that you don't have locked up). This means they can usually flail around and muscle their way out or hit you with their free hand while you're tied up trying to control them.