according to this SITREP -filePatching enables the use of unpacked data and also a script command "filePatching" returns the status of this.
It does not work in current DEV-Branch (19. January 2016). I am unable to load unpacked data. A config I totally broke in the unpacked version of my addon was ignored by Arma.
Also the script command to check filePatching does not exist on the official list of script commands and does not return anything. If run in a formatted hint it returns "any".