The WiFi Mouse app is an Android app that lets you turn your Android smartphone into a mouse. This could be more comfortable to use than a trackpad. The app connects to your computer through WiFi and turns the device into a mouse interface. It lets you perform cursor movement, left and right click, and even middle button scroll. The mouse app uses the device’s display. Unforunately, the app drains a lot of the battery on the smartphone. You can download the app from the XDA forums according to UberGizmo.