I have done the 52" spring swap too. I ran my stock steering for a very short time before I installed my crossover. ( just to steer it in and out of the driveway / on and off a trailer) So I kind of have first hand experience here.
I dont know how much you know about this swap and all so here I go.
To begin with locating the 52's up front moves the axle forward 2" (I know, this has already been covered). To correct for the 2" you need to make your stock drag link shorter (I couldnt make mine short enough with out cutting some threads off, Also, i'm running a zero rate set at 1.5" forward to push my 42's away from the firewall). With my stock drag link I could may be steer left about 10 degrees but I could turn right like no other. To make the stock drag link work you will most likely have to cut the drag link ends down and have them screwed all the way in. This is kind of a tripple wammie on your steering set up. With 2" less on your steering drag link you now have even less suspension movement available at your drag link before it effect you steering wheel to wheel placement. At the same time with the 52" springs you are increasing the suspensions ability to flex. Thirdly,(correct me if I'm wrong) your sway bar will either have to be removed or relocated. If it is removed then I would not suggest street driving with 52's. They are pretty darn loose on the street so with the body roll and short drag link that could cause possible on road steering problems. Stiff shocks might help you out a little but I still dont like the idea. So that is why your stock drag link with 52's just wouldnt work out while wheeling and I dont feel it is safe for daily driver situations either.
(Getting to your zero rate question) So, you could move the axle back closer to its original possition and only have to adjust your stock drag link a little to make it fit. You are still loosing a 1/2 inch of drag link length (2" forward with 52's relocated / 1 1/2" zero rate offset) so you steering / suspension flex relationship will be a little worse than stock but not as bad as 2" shorter. But, you still have the added ability to flex and a less than stock drag link length. So you might be able to get away with it for daily driver and I think it is a compromise in a wheeling aspect. You would gaining flex but loosing steerability during flex... would you be better off than your stock set up for now...? I dont know.
I must admit, some times I do things not cause it's smart / the right thing to do / or popular. Sometimes I do thing cause I fricken want to. Do what your gonna do man, Hope this info helps in your decision.