Ram,
Great idea, although not exclusively yours. That idea (for R/C cars) has been around for a long time. Do you have any ideas on how it would be done? I devised one for my Nitro Rush. It utilizes friction disks and springs just like the full sized ones. Do some research on automotive limited-slip-differentials and maybe you will come up with a simple workable device for R/C vehicles. The only one that I know of at this time is the Torsen Diff. It is expensive, complex, and will only fit a few car/trucks.