So, the rules for Grappling in SR4A are... Probably not all that terrible, as grappling rules go, but they seem to suffer from the same problem that Exalted has in that the automatic key to victory is to have a big guy on your team grapple and immobilize the target, then the rest of you get free shots at him that he can't resist.
That's not my issue, though. What I'm wondering is how in the hell you slap restraints on someone once you have him restrained? You know, grab a guy, shove him facedown in the ground, yank his arms behind him while kneeling on top of him, and force him into handcuffs.
Would it seem reasonable to make that something a grappler can automatically do in the course of the Complex Action he uses to maintain a grip on someone if he already has a Superior Position bonus from getting the target into a better grip or knocking him down? That would require the target to have failed three consecutive wrestling checks.