We would love to see, particularly with the advent of the "add host" and multiple-leader options for tags to create a "Many-category" tag that would work by allowing us to give it parameters to pull and to list EACH of that parameter (in an order).
For instance, we'll regularly need to tag a footing, foundation, and pier and would be great if we didn't have to have the composite piece-together tagS that we use now and just put near one another and instead have a sigular tag that has many hosts and populates the parameter as required for each element. (i.e. 'mark' for each element, always placing the pier first, then the footing, then the foundation - order matters).
I can see this being used other places as well, but that is what comes to mind.
It seems really challenging to do, but it would still be great!