It would be nice, when all items are selected you can decide if you want the standard title "n selected"
or a (custom) title like "all pizzas" ...

for my purpose i used the "selectAllText", like this in (quick&dirty, LN 146):

if(options.length == select.find('option').length){
return this.selectAllText + ' ';
}else{
return options.length + ' ' + this.nSelectedText + ' ';
}