It has potential but I think it can be improved in some ways.
The pie-menu operates a bit odd: I'd prefer to hit hotkey and then it stays open until you either hover away or hit escape key.
I think it should 'go to' (i.e. frame) the selected favorite by default. There's still uses cases for just selecting the object, but in most cases I believe you actually want to 'go' to the object for further editing.
It would be great if the viewport camera position was (re)stored as well.
I also think there's a missed opportunity not defaulting to CTR + ALT + RMB for adding objects.
Man, that is one good feedback! Thanks for this, I'll update the addon as soon as possible.
I had an initial expected outcome that is obviously not the case. I assumed this would allow me add specific objects that could be added o any scene just like a primitive, except something of your own choice. Meaning it would save them somewhere in the user data preferences, and allow to add like the objects in the add menu.
If it is only to select or focus on items within the current file, that seems more like a viewport camera issue.