Hello Blazkowic,
"positive aircraft control" rings me a bell about a system that was installed on S76s when equipped with the phase2 and3 autopilots. It was called the Pitch Bias Actuator (PBA) and it was designed to: "improve the longitudinal stability of the helicopter and give the cyclic a positive control position gradient in pitch"
In short, when you were accelerating, it was supposed to increase the need of forward motion with the cyclic, and also to compensate the natural tendancy of the rotor to tilt fore and back with the variations of power (collective pitch)
In case of system malfunction we could deactivate this system by pulling its circuit breaker.
Personally, I've never noticed much difference with or without this system operating.