ACR X RECEIVED GPWS ON VISUAL APCH BECAUSE CTLR ASSIGNED SPD RESTR.

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ACR X STRAIGHT-IN NIGHT VISUAL APCH; FO FLYING. WE FLEW A PARTICULARLY FAST DSCNT AND APCH. AT 12 DME; THE APCH CTLR ASKED FOR OUR SPD. I RESPONDED; `220 AND SLOWING'. HE ASKED `GIVE ME THAT SPD TO AN 8 MI FINAL' I REPLIED; `UNABLE'. HE THEN TRIED TO NEGOTIATE SEVERAL OTHER COMBINATIONS OF SPD AND DISTANCE. WHILE WE WERE TALKING THE FO ADVANCED THE THROTTLES AND DOVE A LITTLE IN AN ATTEMPT TO COMPLY. AS A RESULT; THE GPWS `TERRAIN' MODE ACTIVATED. THIS MODE DOESN'T CANCEL UNTIL THE AIRPLANE IMITATES A CLB; SO WE WERE FORCED TO LISTEN TO THE WORD TERRAIN FOR MOST OF THE REST OF THE APCH. IF WE GOT A HDOF TO TWR; WE COULDN'T HEAR IT FOR THE GPWS. I CHANGED TO TWR AND RECEIVED A LNDG CLRNC; BUT IN THE PROCESS OF HELPING THE FO TO GET THE AIRPLANE STABILIZED; I NEGLECTED TO COMPLETE THE LNDG CHKLIST. FORTUNATELY; EVERYTHING WAS COMPLETED ANYWAY. OBSERVATION: THE FO SHOULD NOT HAVE CHANGED HIS PLAN FOR SPDS; PROFILE; AND CONFIGN THAT LATE IN THE GAME. HE WAS GOING TO HAVE A LITTLE TROUBLE GETTING SLOWED DOWN AS IT WAS; AND ATTEMPTING TO HELP ATC ALMOST MADE THE APCH UNWORKABLE.