[Feature]: Add more playback speed options

[Littux-Dustux]

What feature do you want to add?

0.75x and 1.25x speed buttons and editing of speed using keyboard

Why do you want to have this feature?

Currently, there is only a 1.5x and 2.0x speed option. 1.5x is too fast to watch anything comfortably. So, there should be a 1.25x speed button, and a way to edit the speed using the keyboard.

Any other details to share?

No response