I remember a couple years ago Hamilton started 20th in a sprint race and ended in 5th.Want to make the sprint race really interesting? Make the spring race starting positions be the inverse of either the drivers championship points or the race qualifying order. Lets see just how fast and good the front runners actually are. Or maybe just draw names out of a hat. It would give the mid and back ranked drivers something to strive for during the sprint other than just not crashing.
Friday - Two practice sessions
Saturday - Race qualifying & Sprint Race with an inverted grid.
Now, it might just turn to chaos and wreck a lot of cars or the top tier guys might just slow roll around the track trying not to get into trouble.