When I built my house I rented a telehandler for the early stage work. The framers and roofers used it and then I used it for installing windows with the work platform it came with. It had selectable 3 steering modes. 1. Basic front wheels steer only 2. All wheel steering where the back wheels turned opposite of the front ones for tighter tuns and the real gem #3. Crab steering. You had to have wheels straight ahead to change modes, but you could get right up next to a wall if you wanted to, pop it into crab steering and both front and rear wheels would turn the same way so you could get away from a wall that was only a few inches next to you. That was a lifesaver in a few situations. Being that it was all hydraulic control/drive/steer, it was fairly easy to implement vs anything mechanical.
Just thought it was interesting...
