I'm trying to figure out a way to make a document management/knowledge management portal using Plone4. We really like idea of having a Wiki as a section of our site or, better yet, as a type of document in every space but with wiki-style linking and even preferably with wiki style editing (plaintext with wiki markup, but parsed to rich html on display).
Anyway, what I'm hoping for is some pointers to documentation, extensions and/or literature.
As I wrote in the previous question you created, Plone 3 and 4 have native support for Wiki-style editing. It only needs to be enabled: http://plone.org/documentation/faq/how-do-i-enable-wiki-style-markup
You can customize the default WYSIWYG editor (TinyMCE) in the Plone Control Panel in order to reduce and enable the available formatting options (buttons).