Here is the second tutorial for customizing DAZ Studio's interface, this one shows how to edit and make your own menus. More tutorials to come.
I hope this isn't too difficult, it is much easier to explain this sort of thing with a video. I believe DAZ has posted a video on customizing Studio's interface, but I don't know offhand where it is. Anyway, if you have any trouble following this tutorial, feel free to let me know and I'll try to help.