Board admin setting to limit who receives updates in the update feed.

My company subscribes to the enterprise package, we chose this option because we believed we could work on a shared board and limit visibility of items within a board to assignees only. This feature is available and working. However, all members of a board can view updates in the update feed. As some information shared in updates is sensitive only those who need to know of the update should be able to view it.

We would like a feature to control what updates are sent to the update feed either at the board level or at the item level. Granularity is important so options to control exactly who always receives updates for an item and those that only receive it if tagged would be helpful.