Some extensions use the Layouts (Design -> Layout) of Opencart to work.
In BurnEngine a third party module can be added in the layout “TB_Widgets”.
But how we use extensions that only work with other layouts? As an example the Part Finder extension
1 & 2) This is clear and we already use this often and works great, but..
Some extentions do not have modules like “Slideshow”. With extensions “Slideshow” you can add submodules for every slider you want. The submodules are visible to add in layout “TB_Widgets” for us within the theme. This I believe is the correct way.