I love that InDesign can convert my paragraph/character styles into CSS for me when exporting to epub or xml. But it would be really handy if I could customize what CSS gets exported.

For example, I might have a "ChapterNumber" style and a "ChapterTitle" style in an 8.5x11 book. In InDesign I might set ChapterNumber to have a space below of 1 inch. This looks great in an 8.5x11 print book, but when the book is converted to an epub, the spacing gets converted from "1 inch" to a very high margin spacing in the CSS. Consequently I have to make lots of manual changes to the CSS.

It would be very convenient if instead I could go into ChapterNumber's Export Tagging settings and set that the margin-bottom will always be 2em or something like that.

I can already see what the CSS is going to be in the "Export Details" section of Export Tagging. It would be great if I could change that.