Though the BO105 was the first helicopter with a rigid rotor head, the civilian version had never been equipped with any flight-control assistance like SAS or autopilot. The only flight-control assistance installed is a force trim system by spring loading. Only the military versions BO105 M-P, especially the armed versions, have YAW-SAS to keep the helicopter better in place while aiming and shooting.
What is confusing to many users
is, that they have to pull the stick quite back to hover the helicopter. This 45% back cyclic is completly realistic on the BO105 and these are real values, obtained from two independant sources. Depending on CoG, loads, and flight states the position of the cyclic will vary a lot anyway, so a 0% cyclic at lift-off would make problems on other flight states like fast cruise.
The problem behind this is that the rigging of the controls of real helicopters are mostly not symmetrical like the joysticks we use. So the problem is on the hadware side, since realistic and affordable helicopter sim controls are rare. The force trim system can't be simulated 100% realistically, and would also need corresponding hardware, which does not exist yet.