Hi,
I do not compare a NAS to a personal computer, but AS A BEGINER I just try to simplify some things with a little script.
Your recommandation is to create an add-on just to run a script at startup. You'r right it could be a complete solution with statup and shutdown.
My need is a lot more simple, just run a script to register typical stuff like alias, environment variables and so on!

It could be usefull to have a convention like: place a script named "startup.sh" at the root of your first volume to personalize your environment. It's just a suggestion for an intermediate solution between Add-on, FFP or Alt-F for a
really simple need.
Thanks for your help!