Set Last Played/Last Skipped date of selected tracks to a new date, with option to increase or decrease Plays/Skips.
OS X 10.6 or better only. Previous universal version available at the link below in the "Info" section.
Also see Add or Subtract Play Count.
Like so. The Last Played date of the selected tracks will be set to January 9, 2012 at 10:07 and the Plays will be decreased by 1. The latter is an option that can be toggled on and off with the checkbox.