If on this occasion it landed slowly and stopped quickly, it could have been a combination of very light landing weight and strong headwind on the runway, so that touchdown groundspeed was low. Combined maybe with a requirement to roll through to a high speed turnoff it is possible the crew did no more than 'crack' the reversers to the idle position without actually applying any noticeable thrust. In some cases, this would be good airmanship to get off the runway quickly. Mostly, though reverse is used as described in the above thread - to assist and reduce brake wear and keep brake and tire temperatures down. Reverse is not calculated into stopping performance when the test program is run to certify an airplane but its use is seen by pilots as an insurance policy and normal SOP's do require it to be used. Noise abatement rules at certain airports at certain hours ask that idle reverse only is used. They do not have the right to mandate it, as the pilot will still have the authority to use it if needed on safety grounds. Mind you, at a place like Singapore you would want a good reason otherwise the authorites could give you a hard time.