Currently the only related hotkeys to this are Increase and Decrease Speed Percent. Emulators like VBA have it so you can hold spacebar to speed up and let go to go back to normal speed. This would be very nice for easily skipping things like unskipable cutscenes seemlessly.
It’s better not to add Because people like to speed up on the onlinegame
There’s a pr open for this, but it’s dead. I will do this whenever I get time.