1. Remove a page as a homepage without setting another one as homepage, as my homepage is a static HTML page, which then has links to go into teh sitefinity websites.
You can do this from /App_Data/Sitefinity/Configuration/PagesConfig.config. When you set a page there is a configuration property - "homePageId" which you can remove.
2. Disable the Set a homepage button.
This is not supported, because the "button" you see is a CommandWidgetElement which is defined in PagesDefinitions which cannot be extended.
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