How about adding a setting to also activate the cap when not making any input for, say, 2 minutes? (AFK)
This could be useful to save power, especially when playing with a fat shaderpack.

I've considered something like this in the past! I wouldn't be opposed to it, but it's never been a priority since you can also just pause and tab out for instant savings lol

Reducing the FPS when playing single player and when the game is paused should also be added. Because it doesn't make sense to render the GUI at very high FPS.

Good idea