This script works in InDesign CS6, at least. It removes all unused paragraph and character styles with one click. Sweet:

var myDoc = app.activeDocument;
var myParStyles = myDoc.paragraphStyles;
var myCharStyles = myDoc.characterStyles;

for (j = myParStyles.length-1; j >= 2; j– ) {
removeUnusedParaStyle(myParStyles[j]);
}

for (i = myCharStyles.length-1; i >= 1; i– ) {
removeUnusedCharStyle(myCharStyles[i]);
}

function removeUnusedParaStyle(myPaStyle) {
app.findTextPreferences = NothingEnum.nothing;
app.changeTextPreferences = NothingEnum.nothing;
app.findTextPreferences.appliedParagraphStyle = myPaStyle;
var myFoundStyles = myDoc.findText();
if (myFoundStyles == 0) {
myPaStyle.remove();
}
app.findTextPreferences = NothingEnum.nothing;
app.changeTextPreferences = NothingEnum.nothing;
}

function removeUnusedCharStyle(myChStyle) {
app.findTextPreferences = NothingEnum.nothing;
app.changeTextPreferences = NothingEnum.nothing;
app.findTextPreferences.appliedCharacterStyle = myChStyle;
var myFoundStyles = myDoc.findText();
if (myFoundStyles == 0) {
myChStyle.remove();
}
app.findTextPreferences = NothingEnum.nothing;
app.changeTextPreferences = NothingEnum.nothing;
}

This is where I found it, just in case I didn’t copy it correctly:

https://forums.adobe.com/message/1106498

I would really like to know about this as well — not just for Paragraph Styles, but for Character Styles as well. This becomes critical when making an ePub, because you really want to remove any unused styles before exporting to ePub. It makes the code clean-up process so much easier when you don't have a lot of unused styles in there.

I have Blatner Tools, too, and it won't let you make a shortcut for this, which is a crying shame.

Also sad is that no one has responded to this post yet, since this is something that many people would find useful, if it was available.

Sheri

I'm with Amy on this one. I've been publishing fiction for seven years now at two houses, and we do not number ANY of the pages before the first page Chapter 1. It doesn't matter if there's some sort of “title” page or “section” page (i.e. Part 1), Page 1 is always on the right hand side of the book, on the first page of Chapter 1.

All the “pre-chapter 1” pages (title page, copyright page, dedication, TOC, etc.) have no numbers whatsoever.

Again, I think it comes down to the Publisher style guides, as Alan pointed out.