How to make wiki text editing ("raw edit") default

Foswiki has a 'Raw Edit' link on most screens that gives you access to the plain text editor, so this question is moot. In addition to this there are three ways to temporarily disable TinyMCE:

1. Add ;nowysiwyg=1 to the end of the edit URL to disable it for a single edit,
2. Set NOWYSIWYG = 1 in a web, topic, or personal preferences page to disable the editor for a web, topic or user,
3. Set WYSIWYG_EXCLUDE as described in WysiwygPlugin to disable the editor subject to certain content (e.g. Foswiki macros, pure Code.HTML etc) being in the page. This can also be set on a web, topic, or personal basis.

See http://foswiki.org/System/TinyMCEFrequentlyAskedQuestions#FixingTheButtons in order to get WYSIWYG and Edit buttons.