Exporting Panel setting to a Feature Does anyone know how to add the Panels > Settings > General > 'Make all views available as panes' checkbox to a feature? 

I guessed the Strongarm box but I don't see the setting.
Yes, it's variable and it's in the Strongarm box. His name is ctools_content_all_views. It can be not set by default - then just submit your form and check again.