To be honest, there's little demand for this type of thing so I've been reluctant to add any additional complexity to the exports. In fact, I've been trying to simplify them and make them all more uniform, and you can see some evidence of this in 3.2.
Plus, I was hoping that the reports feature would have emerged by now and sort of take care of all of this. But unfortunately that has not yet come to pass.
So, those are my thoughts. Since there's only one column selection dialog, it might not be too hard to put something in there, but I can't make any promises.