When talking about the shared option of the remote_login_password_file parameter, the official 11.2 documentation states:
One or more databases can use the password file. The password file can contain SYS as well as non-SYS users.
Whiles that's true, it is important to mention that, as soon as you set this parameter on SHARED, you are not allowed to add more SYSDBA users nor to change their passwords. A shared password file may contain non-SYS users, only if they were previously granted SYSDBA privilege, at the time the password file was in exclusive mode.