Combine advisor is the auto adjustments for the internal settings. Fan speed, concaves, etc. You set it how you like the sample and then it'll make adjustments as you go to try and keep it there as conditions change. 

Yes there are other features that will maintain a full machine "John Deere Harvest Smart is a system that automatically controls a combine's ground speed to maintain a consistent crop load while harvesting. It's designed to help reduce operator fatigue, improve grain quality, and increase productivity"