You’re not wrong, an extra 300, 400 is a ton which is why I figured probably isn’t normal. I won’t say definitively unless I have proper info at my fingertips and I don’t for this aircraft.
I remember my instructor telling me while flying a SportStar on a couple of occasions “that’s a lot of power” as I countered sink on final. I’d be thinking “Man, I only gave the vernier throttle a quarter turn or maybe even less!” I’m not sure what the RPM change was, my eyes were outside, but it was tiny.
I hadn’t really flown my JF Arrow yet so I just fired it up. My idle is actually a little over 1,000 RPM. Even if the real JF aircraft does do that for whatever reason, I’m fairly confident our version shouldn’t because the engine.cfg definition seems to indicate 600 is minimum and min_gov_rpm is 700 RPM.