I did actually try what you suggested, but it didn't make any difference. Pose symmetry does work for pure rotations on the tentacle actors, but unfortunately, it copies the morph values directly, so lTentA01:SideSideAll = 2.0 gets copied to rTentA01:SideSideAll also = 2.0, but those master channels are additive valueOps on the tentacle zrotations, so both tentacles curl to the left (+ve zrot), whereas, since they need to be symmetrical, there should be a sign change as there is with just the pure zrotations.

With left to right symmetry applied on only rotations, the correct result ensues:

With a master control set on the left, symmetry just copies the save value to the right side, giving non-symmetric results:

To get the symmetric result, a sign change is required. Poser could do this, with a bit of intelligent exploration, but doesn't ATM:

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