Currently there does not seem to be a way to get a reference to all kendo controls within a specified element or otherwise and perform generic operations on them.

I would propose you be able to call a JQuery method and do such things as the following:

    $(.kendoControlClass').each(function () {
        $(this).getKendoControl.enable();
    });

or call methods on specific type of controls

    $(.kendoControlClass-selectable').each(function () {
        $(this).getKendoControl.clearSelection();
    });