I use the current version of Rig Manager for Windows. I notice that if I click any effect or stomp that is currently off that I then need the click it a second time to turn it on. Not a lot of extra effort, but I can't see any reason I'd want to just click one that's off just to see the blank editor section telling me it's off.
This is probably since the first click is just selecting while additional click toggle on/off. But the selection could easily be handled by mouse over, etc. Or since if the effect is already off as it's clicked it seems you could easily toggle it on.
A small thing, but at least it would save extra clicks or button pushes.