User Problem

I'd like to set more granular permissions on a Trello board to control who can delete/update existing Trello cards on a board without making them an Observer and restricting other actions.

I'd like to allow Observers to add attachments to my boards.

I'd like to restrict visibility of comments to certain board members.

Suggested Solutions

Add an option in the board settings to restrict who can delete or amend existing cards on a board, but allow creating new content.

Add an option to allow Observers to complete more actions on boards (e.g. not be able to change the due date but able to "Mark a card as complete")

Add an option to restrict visibility of comments to certain board members.

Current Workarounds

Making someone an Observer prevents them being able to delete cards, but this also stops them completing other actions on the board