Speeding up windows logon/logoff

Hello all!

Even though we have a network of windows computers only, we have decided – for security and comfort reasons – to have our server as a mac one.
Everything does work fine, it is configured with OD and as a PDC, so the users can log in with their windows machines – an we are quite satisfied with it.
The only problem is in regard to roaming profiles, which is enabled by default on the mac server.

I think it’s quite neat to have a roaming profile, and having all the configurations on every computer you log in, but some people are experience extremely slow log in/ log off times. And they should, as some profiles take as high as 23GB of space (!!!!!).
As noted on this link https://www.afp548.com/forum/viewtopic.php?forum=18&showtopic=16091 , I can have it disabled by configuring each computer individually. But I know that if I had mac clients, I could configure exactly what directories to synchronize only. So I could synchronize all the application data, but no music/my documents folder!
Is there any way to accomplish this on windows clients?

Thank you very much!