Clear STS:
"The manual trim selector on the A320 demands 1 degree a second but the autopilot in it's much less"
I'll say it is: it's zero degrees per second with the A/P in! The rudder trim is disabled with A/P engaged. More to the point, why would you need to manually trim rudder with the A/P in anyway? It is always a good idea to trim for SE before engaging the autopilot but not because it otherwise has control problems ,but because (as I understand it) it applies rudder quite violently if out of trim when you engage the A/P.
I find manual thrust when flying single engine easier because you can ANTICIPATE thrust changes (and hence trim changes) better. If doing a CAT3A autoland, you need A/THR anyway so the thing flies itself without worrying about trimming etc.
From perf A (?) I believe 5 deg of bank towards the live engine improves the situation by reducing the rudder demand and thereby decreasing VMCA (increasing your safety margin of control). In fact, I think that VMCA is calculated assuming this bank is applied.
Hope this is of use, and always I await the usual corrections/feedback/insults...!
AB
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...proceeding below Decision Height with CAUTION...