Using the throttle deselect buttons clicks out the MCP A/T switch, I believe. A SINGLE push of the TOGA button gives reduced g/a thrust with 2 engines, or full on one as long as 'speed' is deselected, but A/T left engaged in 'ARM'.
Having just done a 700 convex there seems to be some question over whether there is some extra 'built-in' fail-safe with auto-throttle disengaged. Did not have time to try it in the sim. Does anyone know?
While on the topic, given that min speed reversion is based on 1.3xVs, does anyone have the definitive margins for the 'knots below 1.3xVs' (if any) at which it cuts in and to which number of knots above it jumps?