There is no limitation on who is logged in to the admin area. but i can see a possibility of this causing an error if the admin users are inserting products, although i don't think this is the case here.
in regard to the sorting, you can change the sorting by opening the menu.php in the CSSMenuWriter/cssmw_home
and change line 91 to
$query_menuwriter_categories = "SELECT CategoryName, CategoryID FROM ps3_categories WHERE CategoryParent = 0 Order by CategoryName";
let me know if you still have any other questions.