I know I may be reaching here, but I wonder if there is a way to get webalizer (http://www.mrunix.net/webalizer/) like reports from the LTM? We are using SNAT to connect to several weblogic servers, ...
I remember seeing an iRule around that logged messages to syslog in the format of a webserver log for just this purpose. I'll have to see if I can dig it up.