FFS2 supplied with OS4 and MorphOS has long filename support with dostypes DOS\06 and DOS\07. That's about the only major change from a user POV.
But, my advice: forget FFS. It's slow and will invalidate if you crash or reboot writing to disk. Use SFS, or if it works on OS4, PFS. You should probably leave your boot partition in FFS though, not sure if UBoot can boot from SFS...
