Detaining someone at gun point is going to fall prey to claims of false imprisonment and/or kidnapping as well as using handcuffs would. If you are holding a BG against their will that's the risk you take. I think if I could detain someone safely I would, but it's going to depend on the circumstances/crime attempted etc.
"What is play to the fool and the idiot is deadly serious to the man with the gun."
Walt Rauch,Combat Handguns, May '08