Thank you for the answer.
The this is that I want to transform secondary tabs that I found useless to a right sidebar. Like the one you can find on backend/backend/users/myaccount url.
I create a lot of plugins thanks to the builder plugin and I don't want to always override the create.htm and update.htm file with a modified version converting secondary tabs into a sidebar.
That's why I wonder if this plugin would allow me to globally define it, and get the correct layout with sidebar automatically when I create a new plugin.