Simple and easy way to let games run faster, not to be confused with turbo mode.

I'd like an option to easily speed up games by a percentage value between 100% and 200% compared to the normal speed.
For example with 120% just target a higher framerate e.g. 60 instead of 50 for PAL games or 72 instead of 60 for NTSC games, this should work great with VRR displays.
Note that I'm not just interested in running PAL games at 60hz I want to run any game at a higher base speed, some games are just to slow otherwise.
Also this option should be easily accessible from the quick menu, maybe even hotkeys to increase/decrease in 5% steps.
Turbo mode should of course still work normally.

I played Terranigma PAL version at 60hz which ran great apart from the higher audio pitch but that's to be expected.
For this I used one of the settings that allows for higher deviations from the target framerate with the display set to 60hz but I can't find that now.

So what I want is an option that I can set to 120% and then all games will run at +20% of their target framerate.
If the option "Sync to exact content framerate" is on also make sure this uses the right framerate.

Start by locating the quick menu and frame-timing paths that handle target framerates, exact content framerate, and turbo mode. Define how a 100–200% percentage setting and 5% hotkeys should interact with those existing options, then verify that normal speed, turbo mode, PAL/NTSC timing, and VRR-oriented output still behave as requested.