Here is a picture of the feature request (Alex, if you are reading, please add a link to this discussion to your feature request post, thanks)
We use bundle instead of bundle by name because at least this way LabVIEW grows the bundle automatically when we add new elements and we can figure out during debugging that we forgot to wire them (believe me, it has happened to me too!).
We already have a "dummy" cluster for the argument, this feature request would require yet another dummy cluster. If we get enough kudos to the idea, we could add this. Another option would be to add a scripting tool to modify the existing arguments for an event (feel free to add that as a feature suggestion).
I would prefer if LabVIEW would just make the cluster available via the event node, luck would have it, there is already an Idea Exchange entry for that, please vote for it. Who knows, we may get it 😉