If you want to use AD but use a local home folder do this:
Join the macs to AD, and when you join them go to directory utility>Services>Active Directory, Click Show advanced options and make sure you have force local home ticked, and use UNC path. Once joined and you then use an AD account from the login window it will create a home folder on the local hard disk of the mac but mount the users home folder (or closest shared folder to the home folder) as a share in the finder. To see it on the desktop you will need to go to finder > Preferences > General and have Connected servers ticked.
I have seen Sibelius run directly from a network home folder, but i remember older versions use to be problematic, hence the recommendation above.