[Chang]

I don't know if this is a bug or feature in iBooks because it's just a tricky way to link TOC and headers together. I would like to hear your opinions.

I'm using InDesign CS5 for creating EPUBs and my goal is to edit the book as much as I can in InDesign to avoid editing EPUB file after I have exported it from InDesign.
Sometimes I might have heading with capital letters e.g. "HEADING". For me this is ugly if it's showed the same way in TOC. I have circled this problem by writing another heading with normal letters e.g. "Heading" above the real heading. That means, I will have two headings: "Heading" and "HEADING" but with two different paragraph styles.
I use only the upper heading's paragraph style for creating TOC so it would read "Heading" in the EPUB's TOC. Now, my TOC is fine but I have two different headings showing in the text.
I circle this problem by adding display: none; for the upper heading's style in CSS. Now, my TOC is fine and only the real heading ("HEADING") is showing in the text.

This works perfectly in ADE but not in iBooks. Do you think it's a bug in iBooks and it could be probably fixed some day?

Here's also a EPUB file to demonstrate my problem. Please take a look at it if you have possibility to test it in iBooks.