Hey
Yes you can make it that it only displays visible players
No, it has a very slim impact on your game performance.
Might be added with the new Cold War.
Hey, while we are undetected no cheat out there can be "undetectable".
We have been undetected for the past 3 years in COD. https://proofcore.io/status/
If you get HWID banned either from raging or a cheat detection, you would need a temporary or permanent spoofer.