Not quite sure if this is an easy task. In my Widgets, I am able to move around the buttons using the keys on my keyboard (Up, down, left, right arrows), now, to press on a button, you can do so by pressing enter or spacebar. However, the spacebar is connected to another action and I cannot have it activate the press of that button. This is however automatically there at default, is there a particular way to remap which keys can do what in your UI navigation?
This could also make WASD navigation between buttons possible or pressing Y on a gamepad to activate a button instead of A and so on.