That should be fairly easy to add to the interaction system. Some element to put on the ground that triggers the interaction automatically when the player steps on it.
Later on there would probably some variations.
Option 1: Player steps on it and it fires the event
Option 2: Player steps on it and when he leaves it fires the event.
Option 3: Player steps on it and if fires an even, player leaves and it fires another (different) event.
Option 4: Eventually it could be possible to drop other items on it to have a "type 3" plate keeping activated when the player leaves.
That should be fairly easy to add to the interaction system. Some element to put on the ground that triggers the interaction automatically when the player steps on it. Later on there would probably some variations. Option 1: Player steps on it and it fires the event Option 2: Player steps on it and when he leaves it fires the event. Option 3: Player steps on it and if fires an even, player leaves and it fires another (different) event. Option 4: Eventually it could be possible to drop other items on it to have a "type 3" plate keeping activated when the player leaves.
The current scope would just be option 1 or 2.