This was requested before but have not been replied to by anybody on the PB Team .. so here is a re-request. We have #PB_Any for almost everything else in PB which allows for dynamic code generation and not have to worry about artificially limiting the user.
It won't be added for menu items, as #PB_Any is only for main objects (menu here), not for subobjects which can be numbered as you wish, as there is no memory constraint. It's just an id. Also on Windows there is a limitation which 16 bits id, which would not work with the #PB_Any concept.