Yes, it is enabled and used through your dialer. If you have the .apk's, or since you're new to this, the Applications needed, in the correct folder, you have a lot of new options to do some tweaking. One of the things you can do is totally turn off your lock screen so that all you have to do is press the Camera/Unlock button and it will go straight to your homescreen. Also, audio codec settings, etc.
EDIT: Here, for both of you
http://forum.androidcentral.com/verizon-fascinate/37578-android_secret_code-string-revealed.html . Jorge, it doesn't say much about audio settings, I am still working on finding something on that...Ok, read down on this thread a bit...
http://www.fascinateforums.com/forum/samsung-fascinate-general/282-secret-menus.html