Nippy Blasters for AT, Vanes&Caltrops for AI, EJB move for jump-shoot-hide, move&Turbo 48" for end-game objectives&Linebreaker...aren't they already one of the most versatile units in the whole game?!?
A dizzie wouldn't be very fluffy, it's a long-barreled gun that would look odd on a bike.
The option of Haywire Grenades would be the only think I would like to add, as they are Wyches on Skateboards, so running them as Haywire hit-and-runners would be fun.