hi and happy new year all.
yes, there are autopilot systems available for the 350 and they may well use them. i have never seen one as they are not usually installed in utility configured a/c. the 350 is very stable in the out of ground effect hover and would not be hard to keep stable for extended periods of time (especially of the winds are favourable). in ground effect they can be a bit of a handful but not bad once youget used to them.
cheers
FP