Add “Toggle Fast Forward” hotkey

[Marat-Tanalin]

A suggestion by Vecna:

Can you add this shortcut: "Toggle Fast Forward"? I ask that 'cause in some RPG is awkward to keep pressed the Fast Forward key when you grind monsters... I prefer that the key is always pressed instead to do that manually.

[El-Juancho]

this would be very useful for jrpg games