I'm in the same shoes. I've always been too small for a clutch dirtbike. Finaly got a '94 Honda XR 100 that would fit me last year. I picked it up in a week. Still getting used to the feel for letting the clutch out slow though.
I've driven my grandpa's ol;d tractor around with a manual.
Push down on the right brake+gas=COOKIES!
ORIGINAL: Overpowered
Learned manual transmission operation on dirt bikes first (at 10 years old), then my brother taught me on his Vega (oil burner) - had several sticks since.
Bought a brand new Conquest TSI /5 speed in 87 - taught my Fiance (now wife) in 1 hour how to drive a stick - learn or no wheels.
Currently teaching kids manual on dirt bike - lots of clutchless options, but their experiencing the full nut.
Prefer manual on the Challenger - thats one reason I'm ok if I don't get an 08 auto and wait 3 months for a manual 09.
Eric