To quote from our manual in Normal Procedures, Approach, ILS Approach, CAT I:
Prior disengaging the A/P, the A/T should be left in the ARM mode by deselecting the SPEED-Mode on the MCP. This allows manual throttle control without interference from the A/T system. However, minimum speed reversion protection and automatic A/T GA are provided when TOGA is pressed.
From personal experience that is true both on the classic and the NG (and the OM B quoted covers both variants), however that only covers flight director coupled approaches, i have no idea if that works on autopilot coupled approaches with manual thrust nor if it works on both autopilot and A/T coupled approaches.
Sorry if that isn't the answer you were looking for.