It took a lot of effort, but I implemented configurable controls!
Supporting controllers is something completely new for me, so it seemed really daunting. In the end it wasn't as much the complexity, but more the integration part that really took a lot of time.

I now created a central place where button presses are caught and checked. When a configured button press or release is detected, an event is fired to listening classes.

Next on the list is UI navigation through buttons instead of the mouse!