Actually...
I went for a ride at the great eastern fly-in with Wayne and ask him that very question and suprisingly he said the standard kit is more than capable of aeros. I can't quote exactly but some thing like +10 -4.
In saying that, to all those drifter pilots out there, Wayne is an outstanding pilot! There is aero trained, and there is aero experienced, and then there is experienced in drifter aero flight. Wayne I think is the only pilot in australia (maybe the world) rated to do this and I don't think casa is likely to ever give anyone else that rating. So please don't get any ideas.