Just copy pasting my own post to expand on this request:
There is this potentially great feature to automatically top up an account when the balance drops below a certain threshold. Currently, this can only be done through iDeal or Sofor, but why not allow topping up from one of my other Bunq accounts? This way, accounts can be more easily used as a means of budgeting/grouping certain expenses while also allowing refilling more easily. Just sent a notification and with a click of a button the balance is topped up to a certain amount.