A B777 FO ISSUES FORTH WITH THE PROBS AS DISCERNED WITHIN THE NEW MANDATES AS PUBLISHED WITHIN THE CONFINES OF THE AIRLINE'S OPERATIONAL MANUAL PERTAINING TO SOUTH AMERICAN OPS.

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THERE ARE SIGNIFICANT PROBS WITH THE NEW GUIDANCE IN THE SOUTH AMERICAN OPS INFO TAB; 'TKOF; DEP; ARR AND APCH BRIEFING;' WHICH SAYS 'FLY SIDS; STARS; AND APCHS EXACTLY AS DEPICTED ON THE COMMERCIAL CHART APCH PLATES WHEN IN IMC OR NIGHTTIME CONDITIONS.' FIRST PROB: SOMETIMES FOREIGN ATC GIVES YOU A SHORT VECTOR OR DIRECT ROUTING THAT IS NECESSARY TO AVOID A TFC CONFLICT. TO BE ABLE TO COMPLY; AS REQUIRED BY THE NEW GUIDANCE; WOULD SOMETIMES CAUSE AN IMMEDIATE TFC CONFLICT AND RESULT IN COM AND COORD ISSUES WITH THE FOREIGN ATC CTLR. SECOND PROB: SOMETIMES; WHEN YOU ARE BELOW THE GRID MORA AND NEED TO IMMEDIATELY AVOID SEVERE WX; YOUR BEST OPTION IS TO CHK THE MVA CHART AND REQUEST AN IMMEDIATE VECTOR TO CLR THE WX. TO NOT HAVE THIS OPTION WOULD DECREASE OUR ABILITY AND INCLINATION TO AVOID SEVERE WX AT LOWER ALTS. THIRD PROB: THE NEW GUIDANCE CONTRADICTS THE GENERAL INTENT AND FLEXIBILITY OF PROCS LOCATED IN THE SOUTH AMERICAN OPS TAB; 'SOUTH AND CENTRAL AMERICAN ATC;' WHICH STATES 'THEREFORE; DIRECT ROUTINGS DURING ARRS AND DEPS MAY BE ISSUED AND; SUBJECT TO CAPT'S REVIEW; ARE ACCEPTABLE' (IN A RADAR ENVIRONMENT). THIS GIVES US THE FLEXIBILITY TO ACCEPT VECTORS AND DIRECT ROUTINGS WHEN SITUATIONAL AWARENESS ALLOWS IT AND SAFETY DEMANDS IT. I KNOW FOR A FACT; THAT ALL THE GUIDANCE REFLECTS A CAREFUL AND CONSERVATIVE STRATEGY THAT WAS DEVELOPED FOR SOUTH AMERICA FLYING IN THE LATE 1900'S. THE NEW GUIDANCE; HOWEVER; IS A BLANKET POLICY THAT WILL SOMETIMES PREVENT US FROM TAKING THE SAFEST COURSE OF ACTION. THANKS FOR YOUR HELP IN RE-EVALUATING THE WORDING AND THIS SHIFT IN POLICY AT OUR AIRLINE.