I take Excel for example. At the moment, every time when a user wants to use an add-in, they need to go to insert ==> add-ins and choose the add-in. Then either a take pane or content add-in appears. If the manifest xml of the add-in has add-in commands, users can launch the add-in via menu or ribbon.
If the user closes and re-open Excel, they need to go to insert ==> add-ins again and so on... It is tedious.
Is it possible to set an add-in loaded by default (either by developers or users)? For example, each time the user opens Excel, they could see the item in the menu or ribbon (or even the task pane) to launch the add-in.