As we've seen, Duralumin can store not only Connection to people, but connection to places. This may suggest that you can store Connections to anything. Can this work for anything? Could you store a Spren bond in an unkeyed metalmind and give it to another Duralumin ferring? How would a Spren react to being temporarily Connected to two people at once? Obviously, some power systems are also keyed to Identity, but storing Identity opens a whole 'nother bag of worms, like storing Mistborn status or something.
Could you store your Spiritual, Physical and Cognitive Connections to each other? Could someone tap an unkeyed metalmind of someone else's Connection and possess them, or steal their relationships? How would your Spiritual aspect react to being Connected to two different bodies at once?
Are there different types of Duraluminminds, like tinminds? For example, social Connections and Connections to places? This would be helpful to nerf Connection storage, so that you could not, say, be a famous Youtuber, periodically store your *millions* of parasocial relationships, and use that to forcibly bond spren?
According to Brandon Sanderson in https://wob.coppermind.net/events/188-general-reddit-2015/#e3923, your age is also a Connection between your three aspects, which made TLR's immortality difficult because his Spiritual aspect was pushing back. Can Duraluminminds store specific parts of your Connection, or only a equal portion of all the "parts" of a Connection. For example. could you store only the age portion of your Physical-Spiritual aspects connection to fix TLR's problem? All kinds of shenanigans might be able to be played with disconnecting certain parts of your Connections! Could you make yourself forget something by storing your Connection to a memory in the Cognitive Realm?
How does being *partially* connected to some things work? If you are storing 50% of a spren bond, would breaking the oaths give the spren 50% of the pain? Would your surgebinding and healing only be 50% as powerful, and your spren able to detect you half as well?
Unfortunately, I don't have enough time to put all my questions into words, so that'll be all for now. Duraluminminds just might have just as much potential as Nicrosilminds, as absurd as that sounds. It just seems like a very interesting topic to talk about.
Note that much of this could also apply to Bondsmiths...