Are you sure about the stock rates? I think most springs would be stiffer in the front and softer in the back for braking purposes at least. Maybe Honda set it up for slight understeer?

H&R and a few other companies make coilovers for some cars non-adjustible in the rear and only adjustible in the front. A lower/stiffer car in the front would increase oversteer. Why Neuspeed would put even softer springs in the back though is beyond me. I really dont like them all that much anyway.