you can not save to a network loaction to be shared but you can share the customization...
these setting are saved here:
C:\Users\*USERNAME*\AppData\Roaming\Unigraphics Solutions\Solid Edge\Version XXX\Customization
we just created a simple batch program for this.
the program just copies our "company theme" all xml files from the network location onto the client computer
we then just located it on a departmental website and have all users just launch the program from there