Currently on a comment, you can only mark it "private to my company". This is almost worthless when everyone in your company is....well in your own company. We need to be able to mark comments as private to a team or to individuals.
We are an internal creative agency and our "clients" are our marketing partners so we're all in the same company. But there are times we need comments just in our own smaller team or set of individuals.
And yes, we have set up security so the marketing teams can only see comments in which they are tagged and we, in the agency, can see all comments. But, even within our agency, we need comments just within our smaller teams...such as project managers, creatives, etc.