Throwing upside down is both useful and stylish. DiscDogger Weekly #14 features several upside down throwing lessons used to shape and control collection and pursuit of discs and to help shape a better leaping catch. Ron Watson lays out 4 basic upside down throws and goes over some throwing tips & technique for making them work for you.
Reading the disc is a skill that astute dogs and humans pick up rather quickly. The float, the Spins and Twists are tricks where the dog spins 360 degrees in a clockwise or counter clockwise fashion. Spin is clockwise and Twist is counter clockwise so it is important to have a More, and the speed can reliably be gauged and predicted after several reps. Of course this changes with wind, disc choice, and throwing ability but, generally speaking, the flight path of a disc is easily predicted.
Shaping is a learning technique where successive approximation and a Positive Marker are used to teach behaviors and communicate concepts. Successive approximation essentially means continually closer to the target behavior. So Shaping is More a Leaping Catch can, and should be a full time job. Always throw with the intent to deliver the leaping catch unless working something specific that requires a specific approach, speed or distance that is incompatible with a leaping catch. Out throws are glory, not afterthoughts.
Within a game of disc dog freestyle there are many opportunities to reinforce and shape the leaping catch and to turn the speed regulation required for the leaping catch into a habit that is ever present in your freestyle game.