I don't know. However, with the beta 4.1.5 there's an option in LW to share items on a lan. What this does is create a (1) separate playlist for LW share called 'your-name's LW Tunes'. I found it also seems to create a (2) separate playlist called 'LW'. It seems all tunes imported from LW go into a separate playlist.
I'm a mac user, I'm not sure Win iTunes can automatically copy tunes to its own library immediately after completing dwnlding from LW.
This might not be what you're after anyway.
LW Beta 4.1.5