AN A320 FLT CREW MISMANAGES THE AUTOTHROTTLES RESULTING IN AN UNSTABILIZED APCH.

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ON APCH INTO ORD FOR RWY 22R; SPD WAS AT OUR DISCRETION. WE WERE APPROX 250 KIAS ABOUT 4.5 MI FROM FAF FOR ILS RWY 22R AND DSNDING OUT OF 3000 FT. WX WAS VFR AND APCH WAS VISUAL. CAPT DISCONNECTED AUTOPLT AND CALLED FOR GEAR DOWN FINAL DSCNT CHKLIST AND DEPLOYED FULL SPD BRAKES. ACFT STARTED TO SLOW; CAPT SELECTED MANAGED SPD AND DISCONNECTED AUTOTHROTTLES WITH DISCONNECT SWITCH; BUT FAILED TO BRING THROTTLES TO IDLE. THIS IN TURN MADE ACFT GO TO CLB PWR. UPON ACCELERATION; WE TENDED TO GET HIGH AND FAST XING FAF UNTIL HE FINALLY GOT THROTTLES TO IDLE. SPD WAS ABOVE 200 KIAS AND BY THIS POINT ACFT WAS HARD TO GET DOWN AND SLOW DOWN. DESPITE VERBAL CREW MEMBER CONCERN THAT FOM AS WELL AS STABLE APCH PARAMETERS COULD POSSIBLY BE EXCEEDED; THE CAPT FELT APCH COULD BE CONDUCTED SAFELY AND ELECTED TO CONTINUE. ALTHOUGH THERE WERE SOME GPWS ALERTS; AIRPLANE WAS STABLE TO LAND AND DID SO SMOOTHLY IN THE TOUCHDOWN ZONE AND CAME TO A STOP LESS THAN 6000 FT DOWN THE RWY. HOWEVER; MOST LIKELY STABILIZED APCH CRITERIA WERE INFRINGED UPON. AT NO TIME WAS AIRPLANE IN DANGER OF HARMING PERSON OR PROPERTY. CONTRIBUTING FACTORS WERE TOO FAST AND BIG MISTAKE WITH AUTOTHROTTLE.