GND CREW DIRECTS B737 CREW TO TAXI AROUND ACFT BLOCKING TXWY IN GATE AREA.

Narrative

SEA RAMP CTL ROUTINELY CLRED OUR FLT TO TAXI OUT BTWN THE CONCOURSES. AN ACFT HAD PUSHED FROM GATE AND STOPPED ABOUT 50 FT BACK FROM START OF PUSH (INTO TXWY). THEIR RAMP CREW MOVED TO A POS NEAR AFT PART OF THEIR ACFT AND TRIED TO WAVE OUR ACFT TO TAXI BY; ENSURING PROPER CLRNC. THIS WOULD HAVE REQUIRED OUR ACFT TO DEVIATE NEARLY 50 FT N OF THE MARKED TXWY AND INTO THE SAFETY AREA FOR THE 'N' CONCOURSE; WITHOUT ANYONE POSITUATIONIONED ON ACFT RIGHT TO ENSURE OUR CLRNC FROM THE NUMEROUS PARKED AND UNLIGHTED GND SUPPORT VEHICLES AND BAG CARTS. WE DECLINED THE KIND INVITATION AND THE ACFT WAS TOWED FORWARD TO ALLOW NORMAL TAXI CLRNC. WHAT WAS THE RAMP CTLR THINKING? THERE CLRLY WAS NO ROOM TO TAXI ON THE CTRLINE PAST THE ACFT. IT WAS NIGHTTIME. THERE WERE NO TAXI SAFETY DIRECTORS ON THE SIDE OF OUR ACFT THAT WAS EXPECTED TO MOVE INTO A RAMP AREA WITH UNLIGHTED VEHICLES AND EQUIP. NOT ONLY WAS THIS CLRLY A HAZARD FOR COLLISION; IT WAS ALSO A HAZARD FOR OUR ACFT TO CAUSE JETBLAST DAMAGE BY BLOWING OVER CARTS AS WE TURNED TO REGAIN THE TAXI LINE.