How to set up custom folder creation when using the launcher or ftrack actions?

On the subject of “Create Starting Folders”, for the sake of completeness, here are some examples of files that cannot be tracked (because they were provided by our clients), but our producers need to place them somewhere on our folder tree :
-Clients briefs.
-Fonts.
-Sounds.
-Logos.
-Photos and videos (for mood).
-And even sometimes mesh objects (because more and more brands have inhouse modeling team for their design).

Also, some of the assets we create are outputed from softwares that cannot be scripted (they don’t have an sdk), but we still need to place the files on existing folders.