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Michael Cummings(Pathfinder Roleplaying Game, Adventure Path, Campaign Setting, Companion Subscriber)
One addition to grapple that has a basis in cinema is to allow others an attack on the grappling creature to help release an ally from the grapple. Many fantasy movies show creatures like the kraken wrapping its tentacles around victims only to be injured and release its hold. This really wouldn't change the grapple rules as they stand, but would add an additional option for when the weakling wizard/sorcerer is in the embrace of a grey render.
Helping a friend in a grapple requires a standard action which grants one attack against the grappling creature. If successful, the attack deals normal damage and forces the grappling creature to immediately make a grapple check against the CMB of the grappled creature + 1/2 the damage dealt by the attack (this DC mechanic may need to be adjusted - just taking a WAG (wild a$$ guess) as full damage seems excessive).