F3 would do it, but, as D2 said, not cleared - same as auto wing sweep (lack of clearance cost two lives). The snag was that the system used the rad alt in the final stages of the approach and there was a concern that it would be interfered with by the nosewheel. Having tried it, it worked really well. Auto ILS, auto-throttles and and reasonable plant on the runway.
Makes you wonder why we paid for so many features and then decided not to pay for the clearances. But I guess they had to replace the Blue Circle, which cost a few kids. Just being a bit playful there, you understand.