I believe that Apollo mission control had the ability to upload data and commands to the LM's guidance computer as long as they had an operational communications link. I'm wondering if, from the point of separation from the CSM, there was any necessary procedure for landing which absolutely had to be done by an astronaut in the cockpit?
Some points of interest:
After the braking phase of descent, the guidance computer would default into the P65 program, which was designed to do an automatic touchdown; all the Apollo mission commanders overrode P65 into P66, the semi-automatic mode, so they could choose the exact landing site. (Jim Lovell of Apollo 13 claimed he intended to use the automatic landing if it looked safe to do so, but never got the chance).
The LM did the Descent Orbit Insertion (DOI) burn while out of contact with mission control; let's assume that either the flight plan changed to do two smaller burns just before and after going out of contact, or that the systems were modified to allow command of the DOI burn from the command module, or on a time-delayed command.
The Powered Descent Initiation (PDI), and all subsequent landing maneuvers, occurred while the LM had line-of-sight to Earth.
I know that the lunar module pilot pressed a "Proceed" button to give the guidance computer the go-ahead to start burns of the descent engine; could Mission Control send the "Proceed" signal directly to the computer?
I know that the crew managed various mode switches on the way down; could the altitude radar mode be switched from Mission Control? Could commands be sent over the low-gain channel to adjust the pointing of the high-gain antenna?
I'm aware that P65 had no way of knowing if it was landing in a boulder field and there would be no very good reason to land an LM unmanned, but I'm curious if it was "nearly possible", particularly in the context of a rescue landing.