Usually the water features are a set and forget type situation. Each feature should have it's own valve and once they are adjusted for equal flow there shouldn't be a reason to mess with it again.
You planned on a variable speed pump for your water features so if you wanted increased flow you would use a feature circuit to ramp up the pump speed.
Some good points, especially for those with a dedicated pump for the water feature(s). But not sure everyone uses their water features on a constant basis (especially for the one's that have to use their filter pump to supply flow to the water feature. Some of my neighbors and friends (myself included), only use water features when they want that particular ambience, for parties etc.
For myself, I find that using the water feature on a consistent basis tends to really mess with my pH, so I only use the water feature when I want it on for a particular purpose.
Unfortunately for me, I do not have a pump dedicated for my water feature (3 sprays), so not only will it mess with my pH if I use it all the time, but it drives up my filter pressure, since it adds a restriction to the return flow. Sometimes what I do to get around this issue, is use a valve to bypass the filter and chem manifold, when I want to use the water features for an extended period of time.
Regarding the IntelliValves, Here is how I have finalized my IntelliValve programming. These settings seem to be working very well for me at this point anyway. We'll see how it goes. If you see a problem or have a suggestion on a change, I'm open for that (other than revising my plumbing make-up :lol

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By the way, I timed the IntelliValve movement. I takes 38 seconds for the actuator to move the valve (3-way) throughout the full range of travel (180 degrees). That's about 1.5 seconds per IntelliValve actuator position (1-24).
r.