Hey here!
Thanks for the awesome mode, it seems really well-done and convenient

Is there a functionality to unlink storages from controller?

I use ATM9 with following mod versions:

sophisticatedbackpacks-1.20.1-3.20.17.1150
sophisticatedcore-1.20.1-1.0.0.807
sophisticatedstorage-1.20.1-1.0.1.983

As I understood from the wiki it's impossible.
But maybe I misunderstood and there's a way?
Or maybe you plan to do this feature?

You can actually do that with the linking mode by shift right clicking in the air to unset controller position - then it changes to unlinking. I should add a bit of info on that on wiki / mod description