What is the difference between insertion point types and frequently insertion points in custom auditing configuration?
The following information should help explain the differences between the two settings:
Insertion Point Types – These settings control how the scanner places insertion points into each HTTP request that is audited.
Frequently Occurring Insertion Points – These settings let you configure whether the scanner will avoid duplication in frequently occurring insertion points. If configured, Burp will identify insertion points that have proven to be uninteresting (occurring frequently without any issues generated) and will drop to performing a more lightweight audit of those insertion points.
Please let us know if you require any further information.