Change playback speed bind

Hello
Can you please add an option to bind playback speed increase to a button (for example up arrow key or mouse 4/5 buttons for +5% or +25% playback speed)?
I know it is possible to do with right click > play > playback rate, but it is very annoying to constantly go out of fullscreen just to adjust the playback speed...

There already is a keybinding for that.
You can change the step size in the options.

I will not any new key bindings.