I found myself shifting pigeon-toed because the Buell pegs are spaced outward a little more than the stock ones, so I modified the shifter. After removing it, I cut off the rubber sleeve and took the shifter to a machine shop. They cut off the "nail head" on the end of the rod the rubber sleeve was on and welded a 3" piece of aluminum tubing over the rod (they started with a piece of 1/2" bar stock and drilled a hole just larger than the rod through it). They charged me $21 labor and a couple of bucks for the tubing. I then went to Home Depot and bought a foot of 5/8" clear plastic tubing (the smallest quantity they sell), glued it on the aluminum tubing (its inside diameter is, believe it or not, exactly 1/2") and cut it off flush with the end of the aluminum tubing. I then reinstalled the shifter and adjusted the linkage rod to lower it about an inch.
I covered it with plastic tubing for two reasons - bare aluminum will leave a black mark on your shoes (the ones I wear to ride are brown) and being larger in diameter, the shifter is much more comfortable on upshifts than it was before.
For some odd reason, I don't feel like the rear brake pedal is too short but did mind the shifter length.
Ed