Vista - Printers

In the fall all of my teachers will be getting their own laptops. So we'll
be scrapping roaming profiles. To make my life easier (at least I think it
will), I just want to add mappings to all of the networked printers in theif
login scripts.
1. Lets say users manually set their default printer on their laptop from
the mapped printers i created in their login script. Then they go home and
logon using cached credentials. The should the default printer move to one
of the local printers they might have setup on their laptops? And when they
logon again back at the school, should their original choice of network
default printer be restored without intervention form me?
2. Is there a need to disconnect the printer shares via a logout script?

Thanks,
Jeremy