True Delegation Allowing Assignees Only To Comment and Complete Tasks (Permissions)
This tool does a great job simplifying collaboration, organization, and notification. What is missing is the ability to delegate a task, giving the assignee ONLY the ability A) Mark the Task Complete and B) Make Comments. I subscribe to Pro so I have all the features. Sometimes I am not collaborating, but rather delegating a list of things that have to be done. When I create this list of tasks I don't want "the monkees to run the zoo" so the list should be read only. However, the assignees should be able so make status comments and mark their own tasks complete. Currently with a read-only list I can keep them from editing the list, but am forced to have to mark their tasks complete. It would be wonderful tweak to have such a "locked" list for delegation purposes. This would allow me to coordinate other parties and facilitate tasks for my clients to do and give them the ability to approve and comment along the way. This would address this suggestion too: http://checkvist.uservoice.com/forums/2121-general/suggestions/548517-let-clients-comment-even-in-read-only
Assignees now can add notes (‘nn’), attachments (‘at’) and complete/reopen assigned tasks in read-only lists. Attachments are available for PRO assignees only.
Jennifer Barsotti commented
Per-list permission options would be great for delegated tasks!
"Member" is a rather vague notation, I think
I think we should always allow assignee to complete a task, + add some per-list permission options, like:
 Readers can comment
 Reader-Assignee can edit a task
 Reader-Assignee can create/edit subtasks
Currently a list can have an "Author", "Writer" and "Reader". One simple solution could be to add a new share type of "Member" that would give them the abilities of a "Reader" plus the ability to comment and mark the completion status of tasks. This would totally work for me.