FabFilter

I'd like to see some indication of the modulation range on each knob and slider that has modulation assigned to it while a plugin is not active, and then once active that same indicator should show the current position of the modulated knob or slider.

See Reaktor 5 Razor for a great implementation of this. There is a gray bar that wraps around each knob showing that knob's range of modulation. Note that multiple modulation sources are taken into account for each knob when displaying its range. This one little feature makes editing modulation so much more easy.