Change key repeat rates
defaults write -g InitialKeyRepeat -int 20 defaults write -g KeyRepeat -int 6
Be careful not to set InitialKeyRepeat too low, or you may not be able to type your password correctly.
Create keyboard shortcuts for any app
In system preferences under “Keyboard”, shortcuts can be made for any app actions that are available as a menu item. Defining the shortcut requires copying the exact name of the menu item. I’m unsure how this system resolves when there are two identical menu items in different sub-menus.