While working in a Room Schedule we can create new rooms via Insert Data Row versus placing a room in the model and having it appear in the schedule. This allows us to assemble a project's programming requirements early or at least at the same time as modeling activities are creating the building. There are two settings that will disable the Insert Data Row tool (using Revit 2016 at the moment). This is what it should look like.
If we don't check the Itemize every instance option on the Sorting/Grouping tab the Insert Data Row is disabled.
The other culprit is using the Embedded Schedule feature.
Careful out there...