The best SAS is a pilot. Adding systems in light helicopters means something else to go wrong. Oddly, hardly any design effort ever seems to go into making what is already there lighter. Every pound that's added is one pound less payload. In the past I've flown helicopters which were loaded with kit (R44 with pop outs, avionics for ever springs to mind), but were severely limited in their ability to do the primary job.
KEEP IT SIMPLE!