Soldato
I remember Schumacher arguing he didn't need to slow 'cos he held up his hand to acknowledge the incident. They want drivers to slow, penalise them when they don't. Complaining they don't slow whilst letting them gain an advantage by not slowing is never going to work.
There was the discussion with the McLaren pitwall during the red flag about drivers speeding under the yellows. Give them all drive-throughs!
I remember Hakkinen waving at the marshals twice, once at Monaco and once at the Nurburgring, but I can't recall Schumacher doing it. You struggle to get your hand out of the cockpit now.