You guys are way over thinking this. When you press the heading select button on aircraft that have heading sync the heading bug will center up at the current heading on the directional gyro, period.
In the sim trying to program a key or button ‘set heading bug’ in the manager causes the heading bug to go to ‘N’ or 360 instead of the current ‘straight up’ current heading displayed on the heading indicator.
It is a bug and always has been. It is very annoying that they won’t fix this. The third party systems with ‘heading sync’ by pushing the heading select knob all seem to work fine, regardless of the autopilot system.
The wind, the drift, etc. are issues but have NOTHING to do with heading sync.
I am a retired 23,000 hour plus pilot and always used heading sync to center up on current heading when tracking a couse in NAV/LNAV modes. One push of the heading select button kept me on course when switching navs, gps or vor failure, or whatever. ASEBO obviously doesn’t have many experienced pilots on staff that know heading sync working incorrectly (going to north) is worse than no heading synce at all. HeadindH