The mod exposes SAS mode setting to action groups. It adds this action-group functionality to the stock Avionics Hub, as well as via a new part, the Mk1 SAS controller. This is a small, radially-attached part similar in size to the smaller science instruments, which also functions similar to the avionics nosecone to allow low-level SAS functionality in the absence of a pilot.
If you select the avionics hub or SAS controller in the editor's action groups UI, it has actions for setting the various SAS modes, which you can assign to whatever action groups you want.
This part is compatible with IndicatorLights. It works fine without it, but if IndicatorLights happens to be present, then the part has visual indicators to show when SAS is on or off. Different colors and patterns indicate the different SAS modes.
Unzip the contents of "GameData" to your GameData folder, same as with most mods. (Note, includes ModuleManager.)
Honestly, most people probably wouldn't, it's a fairly niche use case.
It's primarily useful for folks who need to tinker with SAS mode when they're busy in a tense situation where they'd rather not take their fingers off the keyboard, such as when landing. It can also be useful for working with a mod like Smart Parts, which can trigger action groups automatically in various situations.
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