Something as simple as what table does what. The current documentation is nothing but a listing of the tables and field. Any half decent programmer can get this with free tools from the internet. Many things are not obvious by reading the table structure. The data surgeons in tech support have some of this already. Maybe a public wiki or some collaborative effort between report writers would help.
The JobBOSS Data Dictionary for version 12.0 is now published and can be found in the customer portal under the JobBOSS Utilities and References Download section (Document: 27.240.736).