Exactly what are the steps that you are using to Import the Layered PSD's?
Might be a simple change in those steps, will yield what you want and need.
Also, remember that to preserve the Layer structure, you need to Import the PSD as a Sequence, and then can use those Layers in another Sequence.
Bill, I import the layered PSDs as a sequence in a similar way as I import a single PSD except that I check numbered stills and select the file I want sequence to begin with.
For both single PSDs and numbered still PSDs I right click in the project window and select import.
With single PSDs a little window pops up allowing me to check the layers I want to import.
With numbered stills the sequence is imported without a layer choice and simply with layers flattened.
I am using the term sequence interchangably with numbered stills in this case.
I am going to guess here, but I think that the Numbered Stills will be the limiting factor.
Good luck, and thank you for those steps, as they will definitely help others recognize a potential problem.
I submitted the feature request, Todd.