Just and Idea that popped into my head as I was reading this...
What about a
MindMap button/command? Its a kind of neural note taking scheme.
You are typing along and a related but different idea hits, you could hit this button and a new document opens with a hyperlink to the new doc is deposited in the Previous doc and vice versa.
I ran across a feature kind of like this in a flow charting tool once, I forget which (it might have been Rational Rose several years ago); but it has lain dormant until now!
here! Share and Enjoy! ;-)
"That that is, is... for what is that but that? and is but is?" Shakespeare, Twelfth Night, Act IV, Scene 2
"Yet THAT which is not neither is nor is not That which is!" Frater Perdurabo (pseud. Aleister Crowley), Liber CCCXXXIII, The Book of Lies