[SOLVED] sustaining hook chain length

I want to enable my players to maintain the hook length by pressing "SHIFT". (Thanks SquatyPotty+ for making me aware of this function). (Without SHIFT, the hook shoots out and retracts immediately.)

Is it a CVAR setting?

The cvar you're looking for is g_balance_grapplehook_crouchslide

That does it. Thanks, Freddy!