B747 Captain reports unstabilized approach and landing 20 KTS fast. Distractions; fatigue; ATC requests and shortcuts contributed to the fast approach.

Narrative

The reason for this report is because I chose to continue a visual approach to landing which exceeded the flight manual stabilized approach criteria. The touch down speed was 20 KTS above target. At 500 FT I was on the lateral and vertical profile (localizer and glideslope centered) and landing flaps down before the 500 FT point. The landing gear was down and the final descent checklist completed just before the FAF. The touchdown was completed in the touchdown zone and the turn off runway was at the planned turn off. Deceleration after touchdown was with minimal braking and idle reverse thrust. Target airspeed was REF +5 with light winds reported at 130 and less than 10 KTS. Contributing factors were: 1. Some fatigue due to only 6 hours sleep previous 2 sleep periods. 2. ATC requested 'high speed' due to the fact we were #1 for the approach 3. Taken off the arrival track at ZZZZZ waypoint and given direct to YYYYY waypoint. 4. The First Officer forgot (common when operating with a 2 man crew as this is usually done by a relief pilot) the flight attendants 'prepare for landing' call 5 minutes before landing; resulting in a distraction during configuration changes (slowing down) as we approached the FAF. In retrospect; without question I should have gone around but as we approached the 500 FT call everything seemed well within the criteria with the exception of the speed. I remember thinking that everything except the speed is ok and it is still decreasing so I will give it (the approach) a few more seconds then decide on a go-around. I must have then became fixated because the next thing I remember is the flare and touchdown.