This turns on/off your ability to perform a double-click. During a CrossScan, after a LineScan, if you have Double Click, Drag, Text Entry, or Auto-Repeat enabled, you will see the IconWindow with the icons representing those functions you have checked on. Clicking while the finger is pointing to the Double Click icon will clear the IconWindow, reset the finger to the left edge of your CrossScanning area, and FingerScan to your desired target. CrossScanner then sends a double-click to whatever application you're in. Remember, you only need to single-click the target.
If Double-Clicks Target is selected in the Advanced Settings, this option changes from Double-Click to Single Click to provide the Single Click capability when the default action in CrossScanner is changed to be a Double-Click. Operation in the IconWindow is the same, except instead of a Double-Click option, it is a Single Click.