These tools written by SANIK with a batch file written by me can batch unpack and repack SADX .dat files.

To unpack DAT files into sound folders, copy all DAT files into this folder and run extract.cmd. Warning: the DAT files will be deleted!
To pack all sound folders into DAT archives, run pack.cmd. Warning: the folders will be deleted!

The unpacked folders can be used as-is in a Mod Loader mod (like the previous versions of Sound Overhaul).