zx6r from the year 2003-> is probably the best engine for stunting as far as oil pick up's go. the oil pan is so deep it goes deeper than exhaust.
Only problem with extreme wheelies is the possibility that the breather shoots some oil to the airbox. It's possible to do kleen air mod for it which connects breather line to the pair valve. It doesn't stop the engine from smoking, but prevents hydrolocking.(as the breather oil now goes to exhaust and not to intakes).
But that is problem only for those who are beyond balance point.
just keep it topped up from the sight glass and you are fine