Suppported format for USB key

I have both U4 and a U5. Yesterday, I got the software update for the U5, enabling the use of NTFS-formated USD keys - works great!

The main challenge for U5 and U4 owners is that U5 supports NTFS and U4 supports Exfat32 - so the same key cannot be used for both of them…

ANy chance of applying th same magic and enabling the support of NTFS for U4 through the software update as well?