@zorderelda The info you are looking for, unfortunately doesn’t exist outside of the brains of the developers. And I agree we really need to get some documentation on this to grow the list of available plugins.
I’ve done some tweaking of a few plugins and I can say they are not difficult but also a pita at the same time.
I worked on / with 2 plugins the LDAP and the Persistent Groups.
The persistent groups was created by the developers to aid in installing a sql trigger that simulates persistent groups in FOG. It is the most simple one with no menus or outward appearance that it has been installed.
The ldap plugin is a bit more complex, but it also shows you how to create tables, hook into a process. It also has a display/editor page. I can tell you the graphics at the top are fonts based on the font awesome library http://fontawesome.io/
The fog application has and calls out hooks at certain functions and as a plugin programmer you can tie into those hooks to add function to fog.
That is about it from what limited knowledge I have.