K-drive dragging player on grab

[kingpt]

 If you do a grab, while pressing the directional key first, and then LMB, it will drag the player in the direction of the pressed key, even after the directional key is let go.
 It will unceasingly accelerate the player if the foward key is pressed, unendingly slow the player down until he's out of horizontal momentum if the back key is pressed, continuously drag the player sideways if left or right is pressed.
 Additionally, if you LMB first, the game will simply do the grab and ignore potentially wanted strafe if the key is held down.
 If while K-driving you do a jump with foward momentum and perform a backside clutch, if you press LMB first and hold down the back key in order to speed down, it won't, keeping the momentum that the player had when he kumped.