A LATE DSCNT CAUSED THE CREW OF A B757-200 TO MAKE AN UNSTABILIZED APCH AND LAND.

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AT 5 MI FINAL WE WERE HIGH. CAPT STRUGGLED TO GET DOWN AND SLOW DOWN. BELOW 500 FT AGL; AT SEPARATE TIMES; BOTH AIRSPD AND RATE OF DSCNT PARAMETERS FOR STABILIZED APCH WERE EXCEEDED AND CORRECTED. 1200 FPM RATE OF DSCNT WAS REACHED; AND CORRECTED. 20 KTS ABOVE TARGET SPD REACHED AND CORRECTED. IN MY OPINION; THEY WERE MOMENTARY DEVS. AS PNF; I MADE NO VERBAL CALLOUTS OF THE DEVS. AT THE TIME; I THOUGHT IT WOULD ADD DISTR. IT WAS CLR THE PF RECOGNIZED THE DEVS AND WAS WORKING VERY HARD TO CORRECT THEM. I REALIZE I WAS CAUGHT BY SURPRISE AS THE SITUATION SEEMED TO DEVELOP LATE IN THE APCH. EARLY AND PROMPT CALLOUTS OF DEVELOPING PROBS BY ME WOULD HAVE AIDED THE CAPT. OUR JUDGEMENT OF WHAT IS A 'MOMENTARY' DEV AT SUCH A BUSY TIME; WHILE OUR ATTN IS DIVIDED AND CONSTANTLY SHIFTING IS VERY DIFFICULT. THESE SITUATIONS; LIKE MISSED APCHS; REJECTS; AND ENG PROBS HAPPEN RARELY; SO WE ARE SURPRISED BY THEM. I SUGGEST 'SPOT' TRAINING IN THE SIMULATOR DURING TRAINING INVOLVING UNSTABILIZED APCHS; SO WE CAN PLAN AND TRAIN THE PROPER RESPONSES IN THESE SITUATIONS.