For setters in general this shouldn't cause any trouble to return the widget so I could perform more things with it.

For the get-set functions (like value() etc..), if I get a parameter this means I'm using it as a setter hence I might want to do something else with the widget later on... "Chainability" jQuery style.

A small code snippet to illustrate:
//the datePicker is already in place and has been initialized somewhere else
//I would like to be able to do this:
datePicker = $("#aDatePicker") //jQuery Selector
  .getKendoDatePicker() //retrieve the picker
  .setOptions(dpOptions) //set new options
  .value(aDate); //set the current date

//Instead of this:
datepicker = $("#aDatePicker").getKendoDatePicker();
datepicker.setOptions(dpOptions);
datepicker.value(aDate);

Regards
Carlos A Luengas