I'm wondering if there's a list of optional FCOM addons and what they do somewhere? The main FCOM page (I think it's the main one) at http://devnull.sweetdanger.net/fcomoptions.html doesn't have links for most of them.

Also, is that page's install guide, http://devnull.sweetdanger.net/fcominstall.html , a good install guide? Is it up to date?

The FCOM thread is the right place for FCOM questions.

:read: Great things are readme's and http://www.gamesas.com/index.php?/topic/1083374-relz-fcom-convergence/s.
You'll find all of your questions answered in the opening post and the links it contains.