A possible way to solve this issue is to attach a 'keyup' event to the textbox. When the user press any keys, the textbox accepts the entered characters immediately.

Code:

$('#tt').textbox({
	inputEvents: $.extend({}, $.fn.textbox.defaults.inputEvents, {
		keyup: function(e){
			var t = $(e.data.target);
			t.textbox('setValue', t.textbox('getText'));
		}			
	})
})

problem remain ~~

mark~~