I could be wrong but I seem to remember seeing a plugin template that just creates an empty page, which can then be used by a developer to create some functionality. Does such a plugin exist or was I dreaming?
There's a sample plugin shipped by default with CMSB v3 that I think is what you're looking for. It can be found at /cmsb/plugins/samplePlugin.php.
Let me know if I can help with anything else!