The use of Wizard of Oz (WOz) techniques for the acquisition of multimodal interaction patterns is common, but often relies on highly or fully simulated functionality. This paper suggests that a more operational WOz can benefit multimodal interaction research. The use of a hybrid system containing both fully-functional components and WOz-enabled components is an effective approach, especially for highly multi-modal systems, and collaterally, for cognitively loaded applications. The description of the requirements and resulting WOz set-up created for a user study in a traffic incident management application design is presented. We also discuss the impact of the ratio of simulated and operational parts of the system dictated by these requirements, in particular those related to multimodal interaction analysis.