2) The nVidia overlays have never triggered any anti-cheat measure. Have you tested it or is it only an assumption that yours would?
This is an assumption, a concern, and a warning. There is no guarantee that some anti-cheat will suddenly ban you or not.
Since the program does not integrate into the game processes at the moment, this is not a problem. I have been playing with my program for a long time and have not received any bans for using it.
But without a digital signature, I will not be able to integrate into the processes of games and ensure that you will not be banned.
Both Nvidia overlays and drivers, this is a
slightly completely different question. They have digital signatures and direct interaction with developers of operating systems, anti-cheats and games.
1) Audio Notifications would be a great feature. I can set them up with the Advanced Scene Switcher; but a simpler method would be nice.
This has already been planned for future updates.