There was a thread on here with many details and pics of the rear end rosejointed link kits but I think it's been removed, I can't seem to find it anymore. PM me for more info.
Certainly Rosejointed TCA's and solid bushed tension strut joints (S1 or RS1600i) will considerably improve the torque steer at the front end and sharpen up steering response. I don't think they cause that much harshness or shake the shell to bits! S2's are likely to be more of a problem, relying on the ARB to locate the struts!
Martin