Recent advances and availability of consumer hardware has enabled the proliferation of voice, head-gaze, haptic and gesture-based interactions in VR applications. However, interactions are often the result of idiosyncratic designs and little has been investigated about user preferences and behaviour. Elicitation and Wizard of Oz (WOz) studies showed potential to design user-informed intuitive and discoverable interactions in a wide range of domains. In this paper we introduce Welicit, a WOz tool to support researchers in running VR elicitation studies. The system provides tools to adapt the elicitation methodology to immersive environments by allowing users to experience the result of proposed interactions. We discuss a use case in which the tool has been used to uncover multimodal speech+gesture interactions in VR.