Hi Jim,
Unfortunately the plugin documentation doesn’t exist yet because plugins were originally added as a system for integrating 3rd party software (like softaculous) and for custom paid plugins and not for “public” use. This stance has since changed but as a result we still don’t have any documentation :(. If you have a specific question about something you can always shoot us a support ticket that a developer can take a look at to try and help you out. The example plugins that are there are a great resource and as you mentioned, the naming of controllers is consistent with how they are named in the API.