As far as the tilting left or right goes, it will never stay where you want it. It will always tend to wander on its own, but realitively slowly. Its like balancing a 2 foot stick on your finger. You can never just hold still and have it stay, you always have to be watching it and correcting for the tilt.

If you ever see a heli "stationary" in a hover, you know that guy is working his "tail".

For your comment on expensive sims, try a search on Flight Model Simulator (FMS). Its free.