In order to support a particular site, I am writing a database administration app and a database query app that will return formatted results to people viewing the page. The db schema is quite particular to the needs of the website and contains many fields that would be useless to almost anyone else.
That said, I am thinking of writing these apps as plugins to help ease installation and update, along with integration into the current WP website. I have no intention of ever publishing the plugins to the public.
Thoughts? Should I bother writing a plugin or should I just write the PHP and make the relevant pages as include files?