As far as I know, the identifier "$submenu" works a little differently than the requested parameter. It makes it possible to arrange the order of only submenu items and will not help to set the item to the desired line menu.
But if such a method exists and you can give some good examples (apart from example available in manual) how to use this identifier for what is described above, I would be very grateful.
Regarding the second question, then it is assumed that the developer of scripts will be independently tune (edit) the arrangement of menu items in the order he needs in every single taken script or will use all by default as it works now. Otherwise, in my opinion, the expected and logical behavior will be the determination of the last date of the script creation, and all subsequent scripts with the same parameter will set the item in the menu one line below in descending order of date. Anyway it will not work that all the items can be simultaneously on the same line.
So that, if this idea turns out to be interesting and in demand, then can be pondered here all the difficulties that have arisen and ways of solving.
