I have seen the "Ipod Simple" theme and it looks like the theme supplied on the original ipod firmware. I have heard the manipulation of the screen behavior of the volume screen (while adjusting the volume, the progress bar switches places with the volume bar) can be done with the combination of the conditional viewports and volume tags. I have read the Simple guide to wps making and the custom wps page and I still do not understand how to combine the conditional viewport tag with the volume tag. I have to looked at themes that have a similar volume bar such as "Joshpod 1.1" and "Lineart II" and how their wps files use the volume tag with no luck so far. I'm still working on this.
Also, is there a way to make this work without adding patches or any modifications to the current stable 3.1 release of rockbox because all that I think is added to the .wps file is the conditional viewport and the volume tag. I want anyone to be able to download the 3.1 release and just use the theme without worrying about custom builds or patches. :]
If anyone needs a pastebin or a paste here for the modified .wps files just ask.
Any help would be greatly appreciated.