Andrew, I just gave the new Beta a whirl. Good job on getting all of the Photoshop Blending modes in they're working well with editing & syncing to Photoshop. The only blending mode I noticed that wasn't working correctly is 'Multiply' The colour is appearing lighter instead of darker.
I also noticed that after saving and switching back to 3DCoat the newly created layer structure in photoshop doesn't overwrite the one in 3DCoat. I think it would have more clarity if it worked this way as I'm finding it quite hard to work out what has been synced up/merged/transferred etc.. The same should apply with importing Layers colours I think, or at least to have an overwrite Layers option.
I also had a few thoughts on how the Transform/copy tool could be improved maybe which I'll post here
Cheers