Trog:
My understanding of the 412 system is that in ATT mode, when you move the stick, you are temporarily disabling the system's ability to hold the datum attitude.
The way to see this is in the hover, with ATT engaged, just move and hold the stick slightly away from trim and see what happens. When the stick is returned to trim, the system should return (within reason, as it's not that tight a system) to the original datum.
So, in the hover, if everything is set up nicely, you can make minor corrections without using the Force Trim by merely flying against the forces for brief periods.
If you want more on how demon how the system works, PM me.