Option to set the date when changing month or year

Right now, using the arrows or dropdowns to change the month & year does not actually effect the value of the date field: it just shows a new spread of dates to choose from. We've seen a lot of users get confused by this, so we would like an option to update the date field whenever the month or year changes. Currently we're implementing this with callbacks, but it seems worth offering this behavior as just an option. I'd be happy to write a patch if this is desirable. For reference, here are the callbacks we're using for now:

  onChangeMonthYear: function(year, month, datePicker) {
    // Prevent forbidden dates, like 2/31/2012:
    var $t = $(this);
    var day = $t.data('preferred-day') || new Date().getDate();
    var newDate = new Date(month + '/' + day + '/' + year);
    while (day > 28) {
      if (newDate.getDate() == day && newDate.getMonth() + 1 == month && newDate.getFullYear() == year) {
        break;
      } else {
        day -= 1;
        newDate = new Date(month + '/' + day + '/' + year);
      }
    }   
    $t.datepicker('setDate', newDate);
  },  
    
  beforeShow: function(dateText, datePicker) {
    // Record the starting date so that
    // if the user changes months from Jan->Feb->Mar
    // and the original date was 1/31,
    // then we go 1/31->2/28->3/31.
    $(this).data('preferred-day', ($(this).datepicker('getDate') || new Date()).getDate());
  }