It would be helpful to allow for adding a comment to multiple tasks at once. In our workflow, what may happen is that we are tracking several assets being built. Each asset has a task associated with it. We may find that all assets have the same issue with them. Assets may be assigned to multiple people. Hence it is somewhat important that the comment get encoded in each task by way of comment.
I can mass edit status changes as well as folder/tags and assignee. But I cannot with the comments. I've hit this a few times already. I end up having to do a separate pass just to add comments, which is pretty frustrating.