In regards to At Gunpoint, there is a ruling I am trying to find the answer for. It would seem that it can be used to make an enemy drop a friendly scheme marker, like Obey. I am not convinced this works though, since the model does not become friendly when controlled. However, based on the FAQ on Exclusive interview, many players are saying that a Controlled model drops a marker friendly to the controller. This would make banditos much more useful.
I cannot find any direct rulings that support this, however.