Falcon,
As a former (retired) real world helo pilot I can tell you that we used our "autopilot" system extensively. I flew for both the Army and Coast Guard. The AH-1 Cobras I flew in the Army did not have any autopilot systems installed. They had a friction lock type device on the collective to provide some "stiffness" to the control for maintaining a manually set altitude so that you could temporarily remove your left hand from the collective control stick to reach other things in the cockpit. But this was OK for attack helicopters as our missions normally were about two hours (and usually low level tactical missions) and did not involve long distance ferry flights. The HH-65A Dolphins that I flew in the Coast Guard had the ability to maintain altitude and heading with a heading hold and altitude hold function. In addtion, we could couple the flight management system to follow navigation (GPS, LORAN, VOR/ILS, NDB, TACAN) commands automatically. So we could fly fully coupled (or partially coupled) approaches to airports, navaids, or any position we entered in our flight plan (to include any point over the water), and we had a hover hold capability. This ability was a tremendous help in reducing workload on the pilots particularly when doing long searches at night over the ocean. We also used the system when we self deployed to meet our cutters where ever they were. When I was stationed at Coast Guard Air Station Miami (late 1980s), we routinely deployed from Opa Locka Airport and flew to Guantanamo Bay, Cuba, and Port au Prince, Haiti as single a ship. Later in my career, flying out of Northbend, Oregon, we flew long range fisheries patrols far out into the Pacific to monitor commercial fishery activities as well as doing search and rescue operations in all weather. Having an aircraft able to navigate, hold altitude and heading in rough weather was also helpful in reducing pilot fatigue. Having this ability in FSX with the helicopters makes it more realistic.