In drupal 7, I've installed the wysiwyg module. I downloaded the full ckeditor into sites/all/libraries.
I selected ckeditor to use as my wysiwyg editor in the drupal admin. Next, I can create a wyswiyg profile and toggle plugins on and off, amongst others.
I even created a module to add some custom things using HOOK_wysiwyg_editor_settings_alter. So I know all that.
But when I want to add ckeditor addons downloaded from the web, I have mixed results. Some just work if I add them to the sites/all/libraries/ckeditor/plugins folder and add a line to HOOK_wysiwyg_editor_settings_alter to register the plugin.
But some don't. And I never see the plugins reflected in my wysiwyg profile in the admin.
What is the proper way to add plugins to the full ckeditor when using the wysiwyg module ?