Alternatively, you can attach the following as a .js file using the Resources section of the in5 dialog. It will search for page items that exceed the height of the page. Note this code is experimental.
$(function(){
var pageMargin = 20;
$('.page').each(function(){
var pageTop = $(this).offset().top, pageBottom = pageTop + $(this).height(), itemBottom, h, newBottom = false;
$(this).children('.pageItem').each(function(index,el){
$(el).attr('style', $(el).attr('style') ||'' + '/**/height:auto !important');
itemBottom = $(el).offset().top + $(el).height();
$(el).attr('style', $(el).attr('style').split('/**/height:auto !important').join());
if(itemBottom > pageBottom) {
newBottom = true;
pageBottom = itemBottom;
}
});
if(newBottom) $(this).height(pageBottom-pageTop+pageMargin);
});
});