clutchless gear change

[Lawrence]

You can believe what you want, but its been covered many times, and by many different professional people, not just 'the elders'.
If you slam ot into gear over and over again, of course it'll damage the gearbox, but if you do it properly, it won't do it any harm, even if you do ride on the other side of the road :o

Well obviously.  In the same way that doing it badly with the cluch will end up lunching the clutch plates eventually.