Right now we can build up to 15 ranks but get 5 vault tabs tops which isn't efficient if you want to keep one reserved for crew/workshop purposes. It would be very usefull to have at least 1 vault tab for every 2 in game ranks (so 7 in total).
So add these the next time you add level up bonusses for Free companies.
As an FC that uses 11 ranks its sometimes annoying to share these vaults amongst the ranks & avoid abuse at the same time.