We were given the ability to choose mods for our ghosts. Sparrows should be the same way. 
You can ride the sparrow you like and fit it with mods. 
Masterwork: 10 energy. 
These are examples. 
Spawn Summon Rate: 1 energy slowest to 6 energy fastest. 
Dodge from side to side: 2 Energy.
Auto reload weapons while you ride: 2 Energy. 
Increase speed: 1 (2%) 2 (4%) 3 (6%) 4 (8%) 5 (10%) 6 (12%) 
Weapons: Fires bullets from your sparrow: 5 energy: Can over heat requiring a cool down period before you can use it again.
						
					
					
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	Meh, I wouldn't be opposed to any of this, but now that sparrows have instant summon by default I don't think they need any changes. Honestly, I think randomly rolled sparrows are kind of unnecessary. Just make all sparrows 160, and have all the perks be inherent like instant summon is now.