It should be possible to set a model measure (e.g.: AUC) in the Model Simulator operator
Reasoning: The choice of the measure is somehow domain specific and domain experts are tend to be picky about the used measure. If Model Simulator reports the accuracy/error (and I like that it does so), it should do it with the measure we care about.
Proposal: Add a "Parameter" into Model Simulator operator - something like "Main criterion" in Performance (Classification) operator.