For clarity, sparging is rinsing the grain with fresh water. I'm not sure if you use that word for any other aspect of brewing.. For example, recirculation is not sparging and draining the basket is not (that's lautering).
If you're trying to boost efficiency, starting with higher preboil volume and boiling more off for higher gravity batches will do that. Setting the software for a 90 minute boil will automatically call for more starting water. If it tells you that your system will be overfilled, you can change it from no sparge to sparge and then it will tell you how much water to sparge with.
