Another update...
I posted
a newer version of the exe on the ftp. The only categories that will give you output to the RGU right now are Calibration, Owner Info, Sounds & Notifications, Bluetooth & Beam, and Phone & Data. When you press the "Text Only" button it will create (or overwrite) a PersonalOEM-RGU.txt file in the directory you're running it from that should reflect your choices in REGEDIT4 style.
The Today&Appearance panel is pretty non-functional right now, but nice to look at, hehe.
The "Additional Files & Shortcuts" panel is working too, so you can mess around with that and see how you like it. It just doesn't generate initflashfiles.txt yet. Filename is the file the original file will be copied to when it's moved to your OEM file, and destination is where it will end up on your PPC, so you can easily have it copy files to say "My Documents" or something after the flash. So all three of those filenames can be different, just like in initflashfiles. The file list also supports multi-select so you can change a bunch of files destinations at once if you need to.
Edit:
Updated the file on the ftp again.
All panels except "Today" and "Map Buttons" work. I still have the "Create OEM" button disabled, but the "Text Only" button will now give you a "PersonalOEM-RGU.txt" "PersonalOEM-Config.txt" and "PersonalOEM-initflashfiles.txt" in it's current running directory, depending on which categories you have chosen.