I research pedals a few months ago. The only ones available were bolt-ons that fit over the existing pedals. Their mechanical integrity was not adequate for me in aggressive driving. I found a seat position that allows me to heel and toe fairly well if I wear wide athletic shoes.
A while ago in a magazine, I saw "BMP Design" had aluminum pedals for BMW manual cars. With this kit, you can buy their optional heel-toe extension plate which is bolt on to their gas pedal.
At one time I was really interested, but decided not to bother. Now I wear a little bit wider shoes and roll my foot with no problem.
By the way, don't you guys think that the gap between 2nd and 3rd gear ratio is a little bit wide? Had to blip tad more.