Fabrication Parts Data
Fabrication Parts hold a lot of powerful data that would be nice to report on. This data is stored inside each part that can be accessed via the Revit api.
Other information could also be extracted based on the FabricationConfiguration in the Revit model which the Fabrication parts derive from.
Being able to report this data would be huge because they are a 1:1 part (meaning exactly what they look and are in the real world) and would provide accurate content that could help forecast a job or even produce a bill of materials for the job.