WordPress doesn’t give you the option to show a Custom Post Type as the home page. I saw that there are code examples of how to do on StackExchange and I noticed this plugin (which I haven’t tried) that you might check.
Thank you. That plugin (with custom posts) is useful in certain circumstances, but it is not quite what I am looking for. It will display recent “custom type” posts on the front page but has no way of displaying your wiki or anything that is not proper WordPress page as a static page. No big deal. Your plugin is wonderful the way it is. It allows people to set up a mini-wiki inside their WordPress site, and I’ll just a put a link to it from my main page. Once again thank you very both for your prompt response and for your outstanding plugin: it works like magic.