Folgendes im Safari zum Laufen bringen...

var tmp_value = el.value;

            if (typeof el.selectionStart != 'undefined')
            {
                if (evt.keyCode == 16)
                {
                    return;
                }

                el.value = dataArray[i + 1];
                el.setSelectionRange(tmp_value.length, el.value.length);
            }
            else if (el.createTextRange)
            {
                if (evt.keyCode == 16)
                {
                    return;
                }

                el.value = dataArray[i + 1];
                var BXMAGqKQYXNp = el.createTextRange();

                BXMAGqKQYXNp.moveStart('character', tmp_value.length);
                BXMAGqKQYXNp.moveEnd('character', el.value.length);
                BXMAGqKQYXNp.select();
            }