Use the Keyboard preference tool to configure the keyboard to simulate a mouse. To open the Keyboard preference tool, choose System → Preferences → Keyboard. Select the Mouse Keys tab to access the Mouse Keys options.
Allow to control the pointer using the keyboard (Alt+A) – Determines whether the keyboard can be used to control the mouse pointer.
Acceleration (Alt+C) – Determines how quickly mouse motion will accelerate when keyboard directional keys are pressed.
Speed (Alt+S) – Determines how quickly the mouse pointer will move when keyboard directional keys are pressed.
Delay (Alt+D) – Determines how much (or whether) keypress may be dampened or ignored when keyboard directional keys are pressed.