This seems like a fairly obvious suggestion, but I'm requesting to add classification/decision trees to Classification Modeling. I was working with a customer, and they told me, "what's the point of using a classification model if I can't see the tree?" It's also a little misleading in that you do the work to make your model, but then you search around Spotfire to see how you can visualize the tree when in the end you are unable to do it.