That would be an excellent add on for people who have both WxSim and WD 
It would make a lot of sense to add it into WxSim because you already have the forecast data and you also have the code to read data from WD’s files. What would also be interesting would be keeping input data from a few days ago and then re-running it changing different WxSim parameters and checking how well the forecast from a few days ago compared to what really happened. I think that would make an awesome self-training tool for learning how to tweak WxSim to get good forecasts for your own area.