How do you order menus/menu-items precisely ?

Hello,

Concerning script-fu's and their menu registrations:

Besides just "/some menu/some menu item", is there a way to display a menu/item, after a certain menu/item in a given menu ? Like maybe a number in parenthesis, etc... ?

When I refresh scripts, they show up at the bottom, sometimes mis-ordered, and at best, alphabetically.
Even if they will only show up at the bottom... can I control how they are ordered ?

Thanks !