Have a "Player" version
It's all very good one person using a brain at a time - it's great as a personal organisational tool. However, I believe the software has the potential to reach a LOT more people by having a "player" version. This could be implemented by something as simple as a switch on the command line. This way the only things you see when you open the program are the top 50% showing the plex and the bottom 50% showing the notes tab. Other tabs aren't neccesary. Most importantly, thoughts can't be moved or links amended.
For me, this would enable me to create a brain on a particular topic and push the link out to a class full of students to explore and learn from. As it is, the brain screen is too cluttered to be used by the uninitiated 13 year old, particularly as they won't have the ability to save any changes anyway (it would be saved on a shared read-only drive). I know I could use the web export, but (1) I don't like the way this opens some attachments and more importantly (2) this means I have to re-export and move every time I change something.