code: function _ignorable_event(event){
  
  	var retval = false;
  
  	if( event ){
  	    var kc = event.keyCode;
  	    if( kc ){
  		if( kc == 39 || // right
                      kc == 37 || // left
                      kc == 32 || // space
                      kc == 20 || // ctl?
                      kc == 17 || // ctl?
                      kc == 16 || // shift
                      //kc ==  8 || // delete
                      kc ==  0 ){ // super
  			ll('ignorable key event: ' + kc);
  			retval = true;
  		    }
              }
  	}
  	return retval;
      }
docs: Detect whether or not a keyboard event is ignorable.