I have tomcat support I added tomcat support to my apache2 web server, using mod_jk2 connector. This way I just have to add manually the lines to the mod_jk2 configuration file to permit a website to publish jsp and servlets content. There's no way to set it up directly with the current version of ISPConfig, but the manual work you have to do is very little.
I would like to do the same thing. Can you share the lines you add to mod_jk2 configuration file that permits the individual website to use servelets?