My name is Nicholas and I am the Product Manager at Acunetix.
Every so often, we come across Acunetix users who are also using Fiddler to test their web applications. So we have implemented support for Fiddler Session Archives (Fiddler exports), which can be used to pre-seed a scan. This is very useful as it gives a head start to the Acunetix Vulnerability Scanner when crawling the web application, and the user might have already logged HTTP requests in Fiddler to parts of the web applications that are not linked to from the main URL.
More information about how to do this can be found at http://www.acunetix.com/blog/docs/how-to-pre-seed-a-crawl-using-a-fiddler-session-archive-saz-file/
I hope you find this Acunetix update useful.