OnACC if the car has only 2 pedals it will have an automatic clutch and will not shut off the engine when stopped without the clutch. For the rest it is possible to use the manual clutch. During pit stops, the engine must be switched off with a button, while if the car has 3 pedals it will switch off by itself if you stop without clutch.
Thisworks in real cars, but as I said you run the risk of damaging the gearbox. You'll probably find that you are experiencing this "auto-clutch" effect because you already rev match when using the clutch, and if you do a lot of driving/racing with a manual gearbox then you probably already rev match well enough to shift without the clutch.
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assetto corsa clutch not working