Auto pops up the USB tethering settings menu when the device is connected to a USB port (but not when connected to an AC charger), so tethering only requires one click. As far as I know, there is no way to enable USB tethering automatically after plugging in the device. This is the next best thing. When you connect your Android device to your computer, the tethering menu will open automatically.
Enables you to access your device on your network from your computer using a user-defined access name, so you don't have to look up your device's IP every time you want to SSH/FTP/etc. into your device.