Buy a wheel and an H-gate shifter if you want that. GTS has okay-ish clutch support for cars that actually have a clutch and you can even kill the engine (it's very forgiving, though), you can even clutch kick in GTS. Any decent PC sim has proper clutch support.What I want to see is a true manual mode.
With the left adaptive trigger you control the clutch and with the right one the throttle. Thanks to the hd rumble you can hear the engine stall if you don't apply enough throttle when taking off.
I don't think this has ever been done before in a console game or any game of that matter.