That's a pretty cool use case. Not at all what I imagined when you said you put post content next to the links. I'm sure there are a lot simpler ways to implement a FAQ with toggle functionality, but still - this is an excellent hack! Good job!
I'm sure you've thought off this already, but it would be trivial to use jQuery to check how many indentation sprites are used for the post node, and duplicate them for the faq_content. Thus keeping the content aligned with the header-link.
I'll keep this request in the back of my mind when I go through the script next time (adding some more contextual "tags" to the tree output would be useful anyway), but I'm fairly sure your jQuery-selection is the best solution to this particular problem.
(and I love the Settlers of Catan boardgame. Especially with all the cool expansions as of late.
I played (rather poorly) in the Swedish National Tournament five- or six years ago. :) Great stuff.)