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Did you try setting AIM_TYPE_PRESENTATION? The MK500 has a sensor which detects movement, from the help file:
AIM_TYPE_PRESENTATION Presentaion aim type; Appears idle until motion is detected in front of imager window at which time illumination is turned on along with the aiming pattern and a decode is attempted. Currently only the MK500 imager device supports this feature and works only when the soft trigger is enabled.