Clutchless shifting?

[Rabb]

I only shift up without using the clutch.
Only 2nd upwards.
I do it to quickly overtake, and also when pillion riding so that I don't get helmet clash.

[Jon_W]

I use it all the time for up shifting. Providing it is done properly, it won't cause an issue.

My tips are:

Don't bother from first to 2nd, use the clutch.
Put your foot under the pedal, gently pull up then close the throttle gently. The lever will then rise and shift.
Don't down shift. You risk bending selector forks.