You could add a README as an external source if one is not included with the binary package or source repo itself. And yeah I know that isn't basically a longf

You could add a README as an external source if one is not included with the binary package or source repo itself. And yeah I know that isn't basically a longform description field on the AUR page, but comments can do that job too. I don't see it as some crippling issue, and honestly I would probably not even change it - the way the AUR is laid out now makes it easy to pull down pkgbuilds and display package information agnostic to the environment easily. Adding paragraphs of detail into the pkgbuild or on the website limits that.