Custom Apptype on SSL VPN

Setting up segregated DMZ access for some of my sysadmins to access vCenter from a remote subnet but having some difficulties.

Users will be logging in to the SSL VPN web-portal and give a bookmark to vCenter, which requires more than just 80/443 be passed over. I can't find anything that fits what I need by using [style="background-color: #c0c0c0;"]set-apptype[/style], and [style="background-color: #c0c0c0;"]portforward[/style], per the documentation, only allows for a single integer value to be passed through.

Is there a way to set a custom apptype or edit the ports that are proxied through the web app?