New
#330
Retpoline (the Return trampoline as Google, its developers call it), goes back to January 2018 (if not earlier). So Microsoft is aware of it at least a year now!
Now, my opinion is not to get crazy with that stuff, as the gain might not worth all the trouble!
Regarding that FeatureSettings 0x800, I have no idea when and how it got to 800 and as you mentioned, I spent sometime in the net and I couldn't find what this setting is for.
The only thing I found, was that some people had it 800 (most of them) but a lot other had it 0.... Go figure!