I tried the same thing that you did on my machine a little while ago. No indication of movement at all sitting on a flat in either forward gears or reverse and I know from past experience that if I stop on a hill and let off the brakes I will freewheel backwards towards the lake at the bottom of the hill
. (NOT FUN)
I have a hypothesis but no way to test it.
There are stack up tolerances in any assembly. Some will be high and some will be low. I believe that on some units that are at the bottom of the tolerance stack, like your machine and Joey's machine are nearly touching while other machines, like mine are to the high side and don't touch at all. That is why your machine and Joey's machine will creep a little when the clutches should be free spinning. They probably aren't actually touching or are just barely kissing but since it is a wet clutch the oil bath likely works something like a torque converter and will impart a small amount of force to the stationary mating surface. Now assuming that the clutch clamping distance is a fixed and the same on all machines, your machines, because they are so close to start with, don't shudder/judder under a load because they are clamped together "tighter" than other machines like mine since frictional forces are directly proportional to the force applied normal to the friction surface. Machines like mine don't have that extra force that the tighter machines do and so when under a good load (like climbing a hill from a stop) they will tend to slip just a little.
That is my guess anyway.
Now is there a way to "touch off" the clutch so that it is set correctly? I would think that there could possibly be something within the system to allow for clutch wear over time. Either an algorithm or a way to "touch off" so the correct spacing is in there. I read a patent from several years ago that Hyundai took out for a DCT "touch off" system to optimize clutch wear. Surely Honda is ahead of them on that.
Could that be part of the "reteach" procedure that Jackal posted?
I asked my dealer mechanic about it....
I am not going down that road.