It would be nice to be able to change the feedback resistors in SwitcherPro. The text is red and bold, so it looks like it should be able to be changed. In some of the models, (many of the internally compensated devices like TPS62200) it allows you to change the feedback resistors in the compensation "what if analysis". The TPS54620, and others, it looks like you can change the values, but you would have to edit inputs to change the voltage for SwitcherPro to change the resistor values. It would be nice if you could tweak those resistor values, to see its affects on the circuit.