That’s a good idea. I like the “Lookahead Frames” name that @e-tank came up with.
That’s a shame. That means you’ll have to experiment and probably apply some game specific overrides.
You still have to download the test build.
There is no set definition of what “input lag” means, but from what I’ve seen, the more common way to use the term is to describe the overall effect, i.e. “There is lag between applying input and receiving a response”.