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lynx
Nah motorbike gearboxes are different from cars. If you can unload them for a fraction of a second while you change you don't need a clutch at all. Much easier (on the road at least) to try it changing up. Just chop the throttle a fraction to unload and quickly bang it up - with a bit of practice you can make it almost seamless. Start with the higher gears, not the 1-2 shift. Doesn't hurt the box at all.
You can do the same going down but it's very tricky to unload the box the same - you'd need to have the back wheel almost off the ground on the brakes really. Big difference to off road - MX you just stamp down on the shifter, no clutch at all as there's less impact through the transmission from loose surfaces.