Since you can in theory put as many keynotes on any element as you want, in every viewpoint, this is not possible right now (afaik), but rather a wish.
That, however, would still be all backwards, because the whole keynote system is not very "BIM"-esque, to employ that overused keyword.
Instead, in a perfect world, we would of course have an automated keynote placing command, that does put keynotes based on the properties which are already inside the model.
So from every perspective, be it the future, or your current concern, IDs and properties are the way to go.
