There is an obvious option missing for vaults that no one suggested yet. When you set a monthly budget, then a vault could be set to get the remaining money from the budget. So when the end of the month hits, all the extra money (if any) you saved that month would be automatically put into the vault.
Nice idea! I think you should have at least this possibiity or the possibility to count spare to vault in yourbudget as in:
I have started to use both vault and budget recently, and pairing those two feature would be awesome.
Also, they should allow to export vault movement in a report just like any saving account.