The Counter stats are designed with a multi-journal installation in mind, so counter reports would be of limited use for single journals only. However, Journal Managers shouldn't be able to view the report unless they are also Site Administrators; hopefully that addresses your concern about privacy of journal statistics.
The Counter statistics implementation is something that we're hoping to improve upon in later releases, as time allows, so hopefully we can provide more comprehensive information to individual Managers.
Open Journal Systems Team
Don't miss the First International PKP Scholarly Publishing Conference
July 11 - 13, 2007, Vancouver, BC, Canada