To me it would be essential to have sets of pins and flexible use of pins.
These allow to create "dashboards" for different contexts and focuses in work.
Pins could be tags, links, linktypes,... and the sets could be create trough a nested dropdown. This dropdown could be part of TheBrain, a part possibly without jumps. I could also be "all the childs of a certain thought".
Hope this description is clear enough, otherwise I'd be happy to clarify.