I think Sparrow races would be awesome! I only wish we could do some sort of upgrades for them. I know Xur has a couple of things, but it really isn't enough. Let me choose from a few different body types, seats, handlebars, boosters, color schemes, etc. I want to upgrade them and unlock better parts! They could add so much more to this and other aspects of the game (looking at you Ships). Being able to put weapons on them would be great as well. Races, both with and without weapons, would be awesome!