It's a simple fact that a wheel, in the right hands, is faster than a pad. It just is. Certain people who are brilliant with a pad can get close to them and beat people who aren't that good with the wheel, but they're the exception. The wheel is in theory the faster input method, you can't deny that. It should be pretty obvious when the thing we're simulating is controlled in the same way.
With that being said separating the two in any way wouldn't be wise. There are various factors in why one driver is faster than the other, be it skill, their input, their choice of vehicle and they can all balance out in races. It's just something you have to put up with and if you want to be up at the top of the leaderboards you either have to buy a wheel or get insanely good with the pad. Having a separate leaderboard for each would be splitting the community.
With that being said separating the two in any way wouldn't be wise. There are various factors in why one driver is faster than the other, be it skill, their input, their choice of vehicle and they can all balance out in races. It's just something you have to put up with and if you want to be up at the top of the leaderboards you either have to buy a wheel or get insanely good with the pad. Having a separate leaderboard for each would be splitting the community.