I can't speak on how ACAs choose their pairs, but I can offer you this functionality using JavaScript. I added this code to each of my ACA levels:
<input type="hidden" class="acaatt" value="ATTRIBUTE A"/>
Then I put this script in the footer of the ACA Pair questions:
<style>
.acacol {
width: 10%;
}
.left_concept, .right_concept {
width: 40%;
}
</style>
<script>
$(document).ready(function(){
$('#[% QuestionName() %]_div .acapair_table > tbody > tr').each(function(){
var att = $(this).find('.acaatt').val();
$(this).prepend('<td class="acacol">' + att + '</td>');
});
$('#[% QuestionName() %]_div .inner_table > tbody > tr:last-child table > tbody > tr').prepend('<td class="acacol"></td>');
})
</script>