Just read something online about the KLIA Pan Pacific... they now have a check-in counter inside of the International Arrivals hall.
From their website:
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http://www.panpacific.com/KLairport/Overview.html)
CHECK-OUT our latest unique guest facility!! You can now CHECK-IN at Kuala Lumpur International Airport. The hotel's newly opened check-in counter at the airport's International Arrival Hall baggage claim area now adds another superb convenience when staying at Pan Pacific. While waiting for your luggage to arrive, our airport associates will check you in, another effort in cutting down time wasting. Why not try it out the next time you stay with us? NOTE : This facility is not available to Domestic Arrivals.