SPOA's really arent bad. Street handling is fine with SPOA. About the springs theres some things you can do, what i did is make the perches 6" long, which helps reduce spring warp, and you can always add a traction bar, which wont reuce flex. I know some people (even Geoff Beasley!) who keep their stock sway bar, and im going to put mine back in soon too, and set it up like Geoff's. What he did is have quick disconnects using pins and that run through a peice of pipe welded to the spring plate. It comes off quickley, and makes a huge difference on the street--so he says.
SPOA's are very safe for the street, as long as there done properly.. So i mean, no hack job steering, or perch setups.. Therss this truck at my friend's place, (he does not own it, its a samurai), it has a terrible SPOA, the rear perches are made out of a peice of angle Iron, just taked on, and the front perches are trailer perches. The steering arm is terrible, using this cheap steel from a hardware store, to make the drop, and held togeather with bolts.. That is not safe.. I could get some pix of it i guess.