We have several groups of individuals, that need to add comments/discussions to all projects/teams. The only way to do this currently is to make them an Editor of some/all projects so that they can comment. This is proving to be unnecessary as they don't need to edit anything - and adding Editor invites unwanted mistakes that could be disastrous.
Recommend that we consider a "Commenter" role that allows you to do nothing but add comments. Even better, allow the Read-Only role, to be read-only everywhere except for Discussions, where they are permitted to add comments.