If the engines have full climb thrust targeted, moving the lever to MCT or TOGA makes no difference at cruise altitude, where CLB, MCT and TOGA thrust limit are the same. (I haven't seen this written down, however I have tried it out).
If you are in overspeed with ATHR on, idle will be targeted anyway. Hence the QRH overspeed line: Thrust reduction....... Monitor. (If Athr on), so closing the thrust levers will achieve nothing.
For what it's worth, when I am flying the A320 (and especially the A321) in turbulence with large airspeed variation, I switch to speed mode from mach. The Autothrust pins the speed very well compared to the lack lustre performance in mach. On the A321 where the VLS to VMax is often tight, this can really help. Obvious caveat, watch your mach with changing temperature.
Last edited by tom775257; 26th Sep 2013 at 12:51.