Leaning forward enables longer skidding, but at the expense of stopping. There is a sweet spot in the pedal stroke to skid, even in high gears on dry tarmac etc. It's the timing of unweighting with locking your legs.
You can lock your rear leg on the upstroke, then lock your front leg such that you pull up on the front pedal at 3 O'Clock. You'll end up standing but not leaning forward and also stopping with a bit of practice.
Leaning forward enables longer skidding, but at the expense of stopping. There is a sweet spot in the pedal stroke to skid, even in high gears on dry tarmac etc. It's the timing of unweighting with locking your legs.
You can lock your rear leg on the upstroke, then lock your front leg such that you pull up on the front pedal at 3 O'Clock. You'll end up standing but not leaning forward and also stopping with a bit of practice.