I preferr this incarnation of 4wd steering:
fully independent stering (with 4 differentials), so you can turn all 4 wheels any way you want,
2 (new) hemi engines
lots of wheel travel and clearance, etc.
But seriously, people (mostly off roaders) have been doing the 4 wheel stering thing for a while, put a front axle in the back with a steering wheel and its done...
Chevy even offered something like that (Quadrasteer) in their trucks for a while.