At the workshop I messed around with the Stim/Response editor, trying to figure out what one can do with it, and I found some pretty nice applications.
I made 8 different setups with The Stim/Response editor, all with different Stims and a whole scope of Responses. Make things happen on the impact of gas, fire, water, a falling object, moss , frob, holy water and a switch/trigger. There are more "Stims" available, but thats for later worries.
The things you can make happen are numurous; you can make fire, make things disappear, make things move, start sound fx, spawn particle fx and