JIm,
Have you considered having PRESENCE calculate a model-averaged value of theta for the single-season, multi-method model? Reason I ask is that Pavlacky et al. in 'Hieracrchical Multi-Scale Occupancy Esitmation for Monitoring Wildlife Populations' (2012) identify some useful values derived from psi and theta (e.g. psi*theta = probability of small-scale occupancy...pg 156). Suspect others would find this helpful as well.
Mike