I had a simple idea for a feature extension on something already existing: a 'shutter' feature or however one might name it, in order to turn off a digital whiteboard without erasing the things currently written on it.
As it currently stands, there are a number of roleplay opportunities around where the boards are placed. Who has access to them. What is written on them. etc.
A simple, thematic and cool example is to use code names for people, places and projects. That way even if someone reads what is on the whiteboard, they won't know the exact details.