Can notification settings be adjusted for specific Roles or groups of users or is this only adjustable individually by the user?
Solved
Adjust default notifications settings for user Roles
Best answer by Belcher.shane
Under administration/site options you have a huge section for notifications that can be modified based on user type, and the role the person has on the ticket:

Reply
Rich Text Editor, editor1
Editor toolbars
Press ALT 0 for help
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.