[Anak]

Originally Posted by cybmole

so the line spacer controls are useless unless ALL line height CSS is manually removed.

Just put your preffered default line height in the body tag.
For the most flexible epub: put all your preferred settings in the body tag and Remove/delete all matching child selectors.
The child selectors should only contain different values.

.indent {
font-size:1em;
line-height:1.2;
margin:0;
text-indent:0;
}
.noindent {
margin-top:1em;
text-indent:0;
font-size:1em;
}
.center {
margin:0;
text-alignment:center;
font-size:1em;
text-indent:0;
line-height:1.2;
}

Rewritten it should something like this:

body {line-height:normal;margin:0;padding:0;text-alignment:justify;widows:1;orphans:0;font-size:100%;text-indent:0;}
p {margin:0;padding:0;} */ this is the only exception */

.indent {
text-indent:1em;
}
.noindent {
margin-top:1em;
}
.center {
text-alignment:center;
}

The body tag here also contains some unnecessary selectors because they are identical to the user-agent default settings. I.e: font-size:100% = font-size:12pt.