B757 FLC SUCCESSFULLY AVOIDS ACFT PERFORMING AEROBATIC MANEUVER ON TKOF FROM SNA.

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CLRED FOR TKOF FROM RWY 1L AT SNA. WHILE CLBING OUT OF APPROX 500 FT; OBSERVED A SINGLE ENG ACFT CLBING OFF RWY 1R WITH PITCH ANGLE ABOVE 50 DEGS. TO INCREASE SPACING WITH SMALL ACFT; WE TURNED 20 DEGS L OFF RWY HDG TO AVOID ACFT; WHO THEN BANKED R APPROX 70 DEGS TO TURN. WE CLBED OUT AND MISSED THE ACFT AT APPROX 750 FT MSL; THE RETURNED TO ASSIGNED HDG AND NORMAL CLBOUT. THE SINGLE ENG ACFT APPEARED TO BE PERFORMING AEROBATIC MANEUVERS IN THE TFC PATTERN AND ON TKOF; WE WERE NOT TOLD OF SUCH MANEUVERS OCCURRING IN THE TFC PATTERN. THE SEPARATION WAS APPROX 400 FT WHEN WE PASSED THE ACFT. MY CONCERN WITH SNA DEP IS THAT WE DID NOT EXPECT THE ACFT TO BE PERFORMING THOSE TYPES OF MANEUVERS ON TKOF WHILE WE WERE ON OUR TKOF ROLL ON A 5700 FT RWY FULLY LOADED WITH PAX. THE ACFT MUST HAVE GOTTEN HIT WITH OUR WAKE AND THRUST BEING THAT CLOSE; SOMEONE COULD HAVE BEEN HURT. THIS IS A SAFETY PROB MIXING SMALL ACFT AND LARGE TRANSPORT JETS AT THE SAME FIELD WITH ONLY 500 FT SEPARATION CTRLINE TO CTRLINE. FTW DISPATCH WAS NOTIFIED AND MOD -- THE LAX CHIEF ON DUTY WAS ALSO NOTIFIED. THE NMAC RPT WAS COMPLETED WITH SNA TWR MOD WHO INFORMED ME OF THE ACFT TAIL NUMBER.