oh god. not this again. I distinctly remember a thread either here, or in SSFG about somebody who wanted to do the opposite, and pedal directly with his toes (instead of on the ball of your foot)

I can dig it up if you want, but to save you the trouble of repeating history: place your cleat how your cleat should be placed. (with respect to the metatarsal bones in your foot) it may seem unnatural at first, but the improved pedaling form will make you a better rider, and make better use of your leg muscles.