Just cause MF doesnt post here doesnt mean he's MIA but yweah, Ive brought up these concerns before which is why Ive striven to do new entries off the top of my head or backed by my own funny book research.
Oh and luckily for me I dont have TGSB...phew!~
I don't think it's a good idea to add material off the top of one's head, because the documentation likely won't meet TGSB standards. Every bit of information in TGSB is documented by at least one specific story source. This documentation is one of the book's essential features. Original research is really a requirement for new material if we hope to maintain TGSB standards.