The thing about FMS is that it doesn't do anything on it's
own. In order to get your application to record, it needs to be
programmed to record (there is no "magic switch" anywhere that will
start recording for you.)
So, you'll need to either reprogram the 123FlashChat
application to support recording, or build a new application that
does what you need it to. Based on what you wrote above, my advice
would be to build (or contract a programmer to build) an
application that suits your specific needs.