Linking a font, clicktag - a non-hardcoded option for Doubleclick For Pub?

I'm not an expert on the variables available, but I've seen in the past you can set the clicktag to something like:

<script type="text/javascript">
var clickTag = "%%DEST_URL_ESC%%";
</script>

This will get replaced by the ad server. Found from this post:

(We also have an upcoming way for you to specify this in Hype's UI)