Jeff,
That would be a very useful tool for light schedules, building numbers, tree clearing, you name it........just about anything you would want to add a tag to would be very useful with something like that. powerful yet simple so loading different dst control different linked labels. If I knew how to create something like that I could save a lot of back checking on huge projects
consider app like link below connected to any items in your project
http://www.jtbworld.com/SSMPropEditor.htm
I wouldn't find that software useful for this situation, but maybe for the .dst used normally.
My first thought was creating a adapter to represent a Electrical panel which data can be used for panel schedules, 1-lines, floor plans circuiting, etc.....
Even with Revit I think it is hard to use equipment data for 1-lines, etc...
One of the most basic rules is DO NOT REPEAT YOURSELF, & ONLY NEED TO MAKE CHANGE IN 1 PLACE.
I am not sure if you would need a dummy dwg file with layouts to fill data or could add non-existing layouts that would still hold the data.
I just tired of searching, and spending time testing if this or that will work, and many of times get burnt making an assumption.