Turning off c-states should be pretty pointless as they hardly affect performance of any real life application (Or do you know an example showing the opposite?) due to the wakeup delay being in μs scope. Coreparking is turned off for Ryzen CPUs since some Creators Update with balanced energy profile, and maximum performance energy profile of Windows (which should be used with modern CPUs anyway, as they already save power without being told by on OS clock governor) turns it off regardless. I personally think clearing standby list and setting timer resolution is all that we need within such a little tool. And changing registry settings also is quite a different feature set. Edit: However, it of course wouldn't hurt if those options were there, as no one is forced to touch them.