Windows 7 - Shared Network Folder as Default Save location

How can I set a default save to shared folders on the server and keep Windows 7 users from adding these to their libraries?

We are migrating to Windows 7 from XP with many shared folders on a server. In XP we would redirect My Documents mapping to the default shared on the Server and show the My Documents link on the desktop.
As a test, I changed the Libraries/Documents to the location on the server and set it as the default save.
As a result the folder on the server got renamed to "Documents" with the "user folder name" as a sub folder. Consequently all the XP users all of a sudden could not the find the folder on the server. Now I don't know what would happen to the folder names on the server if I did this for all 200 users moving to Windows 7.
Also the folder on the server had all the rights removed for anyone except the owner.
I had to scramble to get that corrected, as this was for our finance office.