The ability to literally link items, to make it apparent that the two items need to be processed together at the same time would be helpful. We previously attempted this using subitems, but that proved to be an unreliable and buggy method. The dependency options do not help.
Our items are clients and sometimes they share an address. Those items need to be processed together almost always. A visual way to see that there is one or more items related that item would be helpful. Something that would be obvious from a glance and/or alert when processing begins. Also, when searched in either the board or the greater search, showing them as connected items would be very helpful.