Sorry I didn't respond before. I'd never heard of RFS until you mentioned it here. I've been reading a bit about it, and I have the feeling that it's not what you want for this job, but I could easily be wrong. If I understand you correctly, you want to transfer files between computers, preserving their file ownership and permissions in doing so? If that's the case, then I think ext3 would be the appropriate file system.
If on the other hand you want all users to have equal access to every file, then FAT32/VFAT would do the job.