I remember jumpseating on BA 757's into Aberdeen many times, and it was quite common for the captain to brief along the lines of "if I land near the TDZ we'll go idle reverse, land long and go full reverse!". I also recall on one occasion when a shower had just gone through, full reverse was planned anyway, and the pax told not to be alarmed about the increased noise or if they felt their necks coming apart! Obviously the length (or lack of) hard surface had a bearing in that... But wherever an aircraft is landing, I think the pilot can judge on touchdown how much or little reverse he / she requires to operate the aircraft safely and adjust as necessary on the roll out regardless of SOP's?