Add a "Watch" button
By clicking on the "Watch" button for a suggestion, a user would be notified on changes related to this suggestion, as if he had voted or commented on.
I would be useful for a user who wants to follow up an idea but does not want to vote for it, an admin for example.
2
votes

With the addition of customizable importance ratings and the option to have them count or not count as votes, you can offer end users multiple ways of receiving notifications.