There are two issues here.
Potential for tail strike with the auto throttle bringing in power at the flare with low speed.
Mode confusion. This is caused by the auto throttle going to MCP SPD mode. Some people think this is the speed protection that you get with de selecting SPD. If the MCP ALT is above aircraft altitude all well and good! However with the MCP ALT below the aircraft altitude the thrust will reduce. Just what you want when you are already slow.
Boeing is not "happy" with de-select SPD or they would not say it is not recommended.
To answer the original post, my airline is All Out or All In! We used to be De-select until we had a few issues on the line and then changed to Boeing.
Last edited by c100driver; 14th Nov 2012 at 06:09.