When you press and hold the IBAN in the overview of one account it automatically get's copied. But when you just click on it to see the IBAN + BIC details like this:
You can only click on "share" to share both IBAN + BIC. If you just want to copy and paste the IBAN + BIC for e.g. a form on the web, it is a bit annoying because you need to manually type in the BIC as you are only able to copy the IBAN with a long click.
So it would be cool if you could make the IBAN and BIC copyable with a long click in this new details window as well, not just the IBAN in the account overview.
.. it is simple, but easy to implement and it wouldn't need any new button :)