As regards rear wheel steering - I drove a development RWS 1/8th buggy once produced by a local model shop. All was good until it slid up to a track marking rope.........
You just can't steer away from the rope! To get the front of the car to point away and back to the track you have to turn in to the rope, which doesn't work. And if you steer away from the rope with the back of the car, thr front end points straight back at the rope!
That idea was quickly shelved I believe.
I did make a 4WS CAT XLS years ago when it had the old style rear hub carriers that allowed you to alter the toe via a threaded rod. Lots of bellcranks and pivots later it did actually work - the rear steer was about 50% of the front. But just too heavy and fragile to be competitive.
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