This is something I desperately want. Don't get me wrong, I think file system permissions are fantastic (they are one of the many things that make Linux superior to Windows), however one place they can be a true pain is when dealing with removable media. Don't believe me? Format your favorite flash drive to ext4 and enjoy having to change file permissions every time you plug it into a new computer. I use Linux on all my home computers, including my media center. Most of my video files are stored on a external 1.5TB ext4 hardrive, which means whenever I decided to watch movies on my laptop off the drive I have to crack open terminal and run
chown -R jeff /media/Storage/
Which is only a minor inconvenience for someone such as myself. For a new Linux convert (or someone who doesn't want to deal with terminal) this is a huge turn off (maybe even a deal breaker for the operating system).
Oh and then there is the other lovely issue of most Linux file systems not being readable on Windows and OSX. Now, even if you are like myself and only use Linux on all of your personal computers - you are aware that the rest of the world does not work this way. Most times when using a computer that is not your own it will be non-Linux based.
The current solution? Format your drive to FAT32, it is permission-less, cross platform, easily fragments, and almost a decade and a half old. It blows my mind that we are still relying on technology every day that was introduced with Windows 95. In addition to being dated FAT32 is limited to holding files of a maximum of 4gigs in size. Meaning all those Blueray rips and most DVD iso files will not be able to be stored on a partition of this type.
What do you think the reason is that we have not see a decent, FOS, cross platform, permission-less, file-system created to date? It seems like it is something the computing world could truly benefit from having.