Driving HT81S without clutch ?

I bump into this video late last night and find it interesting that someone will actually do it on a HT81S. I had heard before that by adjusting the engine speed you can actually shift up and down without the pressing the clutch.


If you look closely to the video, the driver shift up and down when the rpm at around 4-5k hence that should be the sweet spot for the gearbox to synchronize for the gear change. I am not keen to have a try on my car but I would recommend to all to try. If possible, try to record it too and share it with me.
In addition, one of the F1driver had try this method when he was young due to he is too short to press the clutch hence he automatically realize that he can change gear without clutch when the engine rev is right.

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