Enables to have more control regarding return model creation, especially when an error occurs during rendering.

Settings.ReadStoredProcReturnObjectException = (ex1, proc) => {
    if (ex1.Message.StartsWith("Invalid object name '#"))
    {
        proc.ReturnModels.Add(new List<DataColumn>(){new DataColumn("ReplaceTemptables")});
    }
}

This way you get notified and be able to adjust the sp or to build returnmodel yourself.

There is also ReadStoredProcReturnObjectCompleted method which can be used to create/override more complex resultsets. Which is more practical to use in some cases then the already existing Settings.StoredProcedureReturnTypes.