I am currently creating manual graphs using the csv export of the "ALL Vulnerabilities" report and then creating a graph similar to the graph we find in dashboard > overview > vulnerability trending which only reflects on application vulnerabilities instead of all vulnerabilities.

The problem I have is our clients sometimes do focused patching campaigns specifically for OS vulnerabilities and makes reporting on the remediation efforts very difficult. So a chart that includes both OS vulnerabilities and application vulnerabilities will indicate to management that there was good remediation efforts.