I'd probably separate out "bug" issues from adding data.

Even if it doesn't 'take off' right away, you'd do yourself a huge favour by allowing people to add their own entries. If you need to add user submitted data to a moderation queue that you have to check yourself, that's still better than you having to enter things in. By allowing people (who maybe can't help with the programming) to add to the database itself, you are then freed up to do things like, say, work on an API ;o)

(edited for better clarity)