Have seen a lot of weird things done on American setups, But then they run on unusual tracks.
Will give you less pack, which seems to me to be the opposite of what you would want as the front shocks are shorter than the rear so have lower velocity and less pack anyway.
Tried something similar on a xx (red pistons all round 35wt front 30wt rear) back in about 95 and was advised to change it by a chap called Chris Doughty.
Going to smaller pistons on the front helps keep the cars nose up on the jumps.
The other thing Mr Doughty told me was that you should aim for the front of the car to be slightly overdamped relative to the rear (small pistons help with this.)
That way when the car is on the limit and hits a bad bump, or series of bumps, the front end starts bouncing and loses grip first and the car remains reasonably stable and under control.
With the same pistons and similar oil front and rear, what tends to happen is that the front end rides the bumps and the back end shoots up in the air, making the car unpredictable.
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