In your first post in this thread you asked:
Why the PB-datamodell cannot be enhanced in this way?
You call is for for multiple, weighted links per Thought. This topic periodically comes up, raised by like-minded PB users such as Spacenexus (Jim), who would like to see PB act not just as a passive database of loose associations, but as an active participant in our mental logic. I love your phrase "topology of thinking" - that sums it up so well.
I'm sure many people try out PB hoping it will assist their reasoning in the same way as mind maps, concept maps, etc. They are looking to build an AI, expert system shell out of PB. This is a fascinating holy grail. There's no reason it can't be done in the distant future. Even though PB's marketing department and User Guide use terms such as "Brain", "Thought", "forgetting", "remembering", etc., rather loosely IMO, this does not diminish PB's unique abilities as a data storehouse. If you Google for "knowledge visualization" as you have probably already done, you will find numerous attempts to create topologies of thinking.
PB's structure is based on a few very simple ideas - multiparent hierarchy, jump-linked remote thoughts, etc. Keeping it simple also means keeping it fast. Human reasoning is far more complex, and the effort needed to translate this into a individualized visualization database would probably consume far more time than the average human can spare. I would like to see the developers offer an SDK interface for AI programmers to create something truly unique and wonderful, but doubt it will be allowed to happen.
Organizing and displaying data is what PB is best at. Your thread has made us more aware of the steepness of the climb to the next level to which PB can aspire.