Using TiddlyWiki to write a book, in this case non-fiction

It’s not available online. As a wiki, it would be pointless/useless to host it somewhere (multiple monitors!)

Key plugins:
CM6 (@BurningTreeC’s version, it’s the best).
regexps (@Mark_S)
Bundler (@pmario)
EditorCounter (@telmiger but customized)
debug-log-filter (@Yaisog)
action-timeout (@EricShulman)

Truly, regexps is the “busiest” yet most invisible of them all. TiddlyBook wouldn’t be where it is today without it.

FWIW, I don’t use any of the things you listed.