FabFilter

Gate chatter is easily remedied using separate open and close thresholds. Does Pro-G have this?

OK, the manual says "All styles have built-in, carefully tuned hysteresis where needed. This will cause the gate to close at a
slightly lower threshold level than the threshold at which it will open (as set by the Threshold knob), avoiding flutter when the incoming audio signal hovers around the threshold.". That doesn't sound good. The hysteresis amount should not be hard-coded. Many gate plugins have separate knobs for the open and close levels.