Mouse Speed Switcher is an application that was designed to enable you to easily switch 2 sets of mouse settings. This is ideal for laptop users that switch between using the touchpad and an external mouse, but want a different pointer speed / sensitivity for each device.
Right-click on the MouseSpeedSwitcher icon in the system tray and choose "Settings...". Move the sliders for "touchpad" and "external mouse" to the desired speed. Configure your preferred HotKey. Click on Ok and MouseSpeedSwitcher is ready to use ! Just press the hotkey you configured or double click on the tray icon and mouse settings will be switched.