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This doesn't help for FO output, but for what it's
worth, I just made a change to the HTML stylesheets that
puts span wrappers on refname and refpurpose in TOCs.
You can then get tabular style using a CSS stylesheet
like the following:

div.toc {
padding-bottom: 20px;
}

div.toc dt, div.toc li {
clear: both;
}

div.toc span.refentrytitle {
float: left;
text-align: left;
}

div.toc span.refpurpose {
float: right;
width: 65%;
text-align: left;
}

hr {
clear: both;
}