Yippee!!! I'm on the short list!!! Oh, wait....
Seriously Rob, you make a good point about the plot points linking the scenes or storylines.
My main "need" for the rich text and linking is in the descriptions, both of the Plot as a whole and in the Plot Points. When I type in the descriptions, I find it useful that all the relevant links appear. As for the rich text, well, it helps with the descriptions and formatting them in a useful fashion.
Now, to be honest, maybe I'm just spoiled and, when used in practice (I'm not there yet), the links to the scenes and storylines will be sufficient. If it's a big deal, then,ok, I can live without it.
I might recommend the Rich Text functionality be added if only to permit good formatting of the descriptions. As for full linking, I assume that's more of a big deal and is only on my "nice to have" list.