How about a Shadowrun idea? Trait for the speedsters out there?
Speed Freak
Cost: 5 karma
You live for speed and you go faster then anyone. In your first initiative pass, you may take a minus 15 after taking your first turn. If you still have a positive initiative score, you may immediately go again with a full turn. Your score will be reduced by 10 as normal at the end of the pass.
Thoughts?
Throat Punch Games 