Basically:
This mod allows your inputs to register in between visual frames, which drastically increases input precision on low framerates like 60FPS.
There has been some debate as to whether or not this is cheating. The official demonlist has allowed it and a lot of skilled players are ok with it, while other people (including RobTop) say it is a cheat.
Do you think it is a cheat or not?
yeah it gives a huge advantage at high level by modding the game, so it should be considered a cheat as it stands.
it 100% should be added to the base game, its basically a solution to every framerate/refresh rate issue that the shift to 2.2 has caused