DatePicker Plugin Event Interface Problem

DatePicker Plugin Event Interface Problem

The DatePicker plugin allows customization of the display of each day inside the calendar with the use of the beforeShowDay event.

This will work only assuming the information about those days is known before the callback is actually called, which is not ensured when this information has to be pulled from an Ajax request. If an Ajax request is made when the month and/or year selection changes to pull data for evey days in the newly selected month, then this Ajax request is competing with the beforeShowDay event, or am I missing something? 

There should be a setDayDisplay (date, show[bool], class[str], tooltip[str]) method in order to make sure unobstrusive development will be done.

Thanks!