lychee works well for everything and is the best starting point. sorbet shines on high BPM jump maps. panna cotta is made for flowaim players who want help that matches their natural movement.

Press \ during gameplay. The menu opens inside the game client and closes the same way. You can rebind the key in settings.

Yes. Create named configs in the settings tab and switch between them whenever you want. Each config remembers every setting.

Unstable rate controls how precise your key timing is. A lower number means tighter timing. Set it to what feels right for you.

Yes. It's kept up to date with game updates and extensively tested on Bancho.

In your Documents\lychee\configs folder. They're simple files you can back up or share with friends.