From my knowledge jQuery & Kendo datepickers can handle only one date.
Only foxrunsoftware's datepicker seems to handle multiple dates, but the RangeDatePicker is made to handle a range exclusively, not multiple selections.
To handle multiple date selections, you need to write your own implementation. Basically you can start from RangeDatePicker & RangeDatePickerBehavior, change the model object type, the "mode" and event option (onRangeChange -> onChange) and the callback implementation (#getCallbackParameters). You might also upgrade from the existing embedded library.
Or you can request this feature via github issues, but there is no guaranty about the delay (but I can try to do my best) :)