Here you go. This script will add columns to the first array question, hide the following questions and then insert their text inputs and select (dropdown) elements into the new columns.
Code:
<script type="text/javascript" charset="utf-8">$(document).ready(function(){
// Identify the questions
var thisQuestion = $('#question{QID}');
var nextMultiText = $(thisQuestion).nextAll('.multiple-short-txt:eq(0)');
var nextArrayFlexi = $(thisQuestion).nextAll('.array-flexible-row:eq(0)');
// Hide the next questions
$(nextMultiText).hide();
$(nextArrayFlexi).hide();
// Add extra columns to the visible array
$('table.question thead tr', thisQuestion).append('<th class="newColumn1" /><th class="newColumn2" />');
$('table.question tbody tr', thisQuestion).append('<td class="newColumn1" /><td class="newColumn2" />');
// Move the hidden question text to the inserted columns
$('table.question thead tr th.newColumn1', thisQuestion).text($('.questiontext', nextMultiText).text());
$('table.question thead tr th.newColumn2', thisQuestion).text($('.questiontext', nextArrayFlexi).text());
// Move the hidden text inputs and dropdowns
$('input.text', nextMultiText).each(function(i){
$('table.question tbody tr:eq('+i+') td.newColumn1', thisQuestion).append(this);
});
$('select', nextArrayFlexi).each(function(i){
$('table.question tbody tr:eq('+i+') td.newColumn2', thisQuestion).append(this);
});
// Some cleanup styles (for the default template)
$('col', thisQuestion).css({
'width': 'auto'
});
$('table.question tbody th, table.question tbody td', thisQuestion).css({
'padding': '4px 10px'
});
});
</script>
