Since switching over, and as far as I can see, you can only add one back account. I played around with the settings just now, and all I can seem to do is edit the bank account details I have put in. I can't add a second account.
Every edit resets the 3 day deposit timeline (minimum frequency). So you could go in and edit the bank details for the second account to do a deposit three days from the edit, and then edit back for the other account after those three days. A bit of a hassle. Updating the bank details seems to be instantaneous though. It doesn't have that annoying verification process like Payments.