is true, is not accepting javascript also. we have CMS pro that i used in one of our website group that have this option, allow users to add javascripts/php in thier code, is multi-languages support, built-in in compares packages, built-in whois search, built-in sliders, built-in domains extensions page, built-in contact page, built-in menus and nav bars menu, footer links, Seo-friendly and mush more wonderful and fantastic features, we have not yet released for public, but we are in the way to release it.
a dirty way to achieve your goal now is :
1 - create custom plugin that will show what you want.
2 - create a js file that has a ajax request to that plugin controller
3 - in the cms put the line to the js file.
<script type="text/javascript" src="https://xxxxxx.com/plugins/your_plugin/views/default/js/your_js_file.js"></script>
we are using the same method in blesta-addons to list the latest products, you can check html source code to understand well .
our js file has this content
fetch_latest_items();
function fetch_latest_items() {
$(this).blestaRequest("GET", "/plugin/store/main/latest_products/", null, function(data) {
if (data)
$(".portfolio-slider").html(data);
},
null,
{dataType:"json"});
}