RenzoAce
As I travel the world a lot for work I think it would be awesome to have control over some card security functions such as temporarily disabling swipe transactions (very useful in the USA, as they still swipe a lot), disabling ATM withdrawals (general security) or even disabling contactless payments. This works great with the competitor Revolut's cards for instance. On top I'm also hoping bunq will restore the functionality of setting Allowed Countries per card (https://together.bunq.com/d/5650-idea-set-allowed-countries-on-per-card-basis).
All of this would improve security a lot, and could even save bunq a lot of money on card fraud cases.
Give this post a high five if you like the idea :)