The DCF file covers many things, which makes it complicated and not always well understood. This is an issue every installation must deal with. A GUI (like Styler) for .dcf files would simplify the task of specifying this vital information and help users get the most from their Arbortext software.
As I'm certain you know, the DCF has a correlating DTD, so if opened in Arbortext itself, changing it is a bit easier, as it will open context-based options and attribute dialogs. If you are thinking of a brand new GUI (like you mention with Styler), creating an Idea request may be the best option. this helps gauge the interest and value of new features. Thanks!