Rainboe
Most of your comments are very sound and I agree with you most of the time, but to say you would actively arm the approach above the glide in IMC is a recipe for disaster due to the false glide scenario and the increased descent angles involved.
The system i would use and do if the atc screw up would be to disconnect the AP get the aircraft below the glideslope manually and then rearm safely with the automatics back in place so you can then monitor what is going on with some redundancy.
It makes you wonder if the false glide slope and IMC is a factor in this and once they popped out of cloud it was too late to get the a/c spooled up and going in an upwards direction rather than hitting terra firma. Also would the GPWS be inhibited due to the a/c being so close to the airport thinking it was about to land.
just a thought