AN MD80S FO RPTED THAT; DURING LNDG AT LGB; HIS CAPT WAS GIVEN INSTRUCTIONS DURING THE ROLLOUT THAT WERE IMPOSSIBLE TO FOLLOW.

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DURING ROLLOUT ON RWY 30 AT LGB; TWR CTLR INSTRUCTED US TO MAKE A HARD L THERE TO TAXI ON TXWY B; OR EXIT ON TXWY A FURTHER DOWN. AS THE CAPT HEARD THE FIRST PART; HE BRAKED FIRMLY AND TURNED THE NOSEWHEEL L IN RESPONSE. WE FOUND IT IMPOSSIBLE TO MAKE TXWY B WITHOUT BACK-TAXIING ON RWY 30. SINCE RWY 30; RWY 25R AND TXWY B INTERSECT AT A SINGLE POINT; WE WERE NOW POINTED W ON RWY 25R. THE CAPT DIDN'T WANT TO SIT THERE; SO PWRED FORWARD A SHORT DISTANCE TO TXWY D. I CALLED TWR IMMEDIATELY TO ASK IF IT WAS OK TO USE RWY 25R TO EXIT ONTO TXWY D. HIS REPLY WAS NO; NOT REALLY; BUT THEN GAVE INSTRUCTIONS TO TAXI ONTO TXWY D. THERE WAS NO CONFLICT WHATSOEVER WITH OTHER ACFT. LESSON LEARNED: CTLRS SHOULDN'T SUGGEST A HARD MANEUVER; EXCEPT IN EMERS. IN THIS CASE ESPECIALLY; SINCE OUR EYES ARE OUTSIDE DURING ROLLOUT AND NOT GLUED TO THE ARPT DIAGRAM. ALSO; OPTIONS ARE GREAT; BUT WE REACTED TO THE FIRST PORTION HEARD AND THEN IT WAS A BIT LATE TO HEAR OUR ALTERNATIVES. THE BIGGEST LESSON IS FOR THE PLTS; IF THE AIRPLANE CAN'T DO IT; TO SAY UNABLE AND DO THE SAFE THING.