MD11 CREW DEPARTING RKSI ACCELERATES ABOVE 250 KTS ON THE SEL 1B DEPARTURE WITHOUT INFORMING THE CONTROLLER.

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WE WERE ON THE SEL 1B DEP; RWY 33L. PUSHED BACK AT XA57Z. TOOK OFF AT XB11Z. I WAS CONCERNED ON THE DEP TO MAKE SURE WE OVERFLEW JUMUN; ELFIN AND JAWOL ON THE SEL 1B; SINCE WE HAD REPORTS THAT OUR COMPANY WAS NOT FLYING THIS DEP PROPERLY. THE FMS WOULD TURN AND NOT MAKE THESE MANDATORY OVERFLY POINTS; HOWEVER; KOREAN ATC WANTED THEM TO BE OVER FLEW? NOW GOING TO ANC WE HAVE HVY WTS. THIS IMPACTED THE CLB SPDS. ON THE CHART; THE NOTES FOR DEP STATES FOR SPD CTL THAT 'MAX INDICATED AIRSPD 250 KIAS AT OR BELOW 10000 FT.' ON OUR DEP WE TOOK OFF AT 565700 LBS AND THE CLB SPD FOR THAT WT WAS 267 KTS OR THEREABOUTS. THE TKOF WAS NORMAL AND I USED HDG MODE TO MAKE SURE WE OVERFLEW JUMUN. IF YOU FLY STRAIGHT YOU GO INTO NORTH KOREA SO IT'S IMPORTANT TO TURN L. AFTER WE MADE THE FIRST TURN; AND AFTER OVERFLYING JUMUN; THE CTLR ASKED US WHAT SPD WE WERE AT. AT FIRST WE DID NOT UNDERSTAND THE QUESTION; THEN AFTER A SECOND TRY; WE RESPONDED WITH '267 KTS.' SOMETIME LATER; AFTER OVERFLYING ELFIN; ATC TOLD US THAT THERE WAS A SPD LIMIT OF 250 KTS UNDER 10000 FT AND TO TELL THEM IF WE NEED TO GO FASTER. IT WAS MY UNDERSTANDING THAT IF IT'S OPERATIONAL NECESSARY DUE TO HVY WTS TO CLB AT SPDS ABOVE 250 KTS BELOW 10000 FT IT WAS ALLOWABLE. I BELIEVE THE NOTES FOR RKSI DEPS SHOULD HAVE A SPD RESTRS AS IN THE CASE WITH HK WITH ITS LOGAN 2A/2C; RASSE 2A/2C OR SKATE 2A/2C DEPS; HAVING A 220 KTS SPD RESTR TILL ESTABLISHED ON TRACK TO RAMEN (MAX 5000 FT). PLEASE NOTE THE SID 4-20 ALSO NOTES THAT 'RNAV-DEPS: ALL TURNS BASED ON 25 DEG BANK DUE TO AIRSPACE RESTR' AND THAT A HVY AIRPLANE MAY NOT BE ABLE TO BANK THIS MUCH AT HIGH WTS UNLESS OF COURSE YOU LEAVE THE SLATS OUT. IN ANY CASE; IT SEEMS TOTALLY UNREASONABLE TO HAVE TO LEAVE THE SLATS OUT TILL YOU REACH 10000 FT OR TO MAKE A 25 DEG BANK TO MAINTAIN UNDER 250 KTS AT HVY WTS.