Hi 
Welcome to Adobe Forums.
Instead of JRun, Tomcat is embedded with a stand-alone ColdFusion 10 installation. Previous versions of ColdFusion installer allow you to create multi-server installations whereas ColdFusion 10 installer lets you only install stand-alone installation. After installing ColdFusion in stand-alone mode(server configuration), you can create multiple instances and clusters, provided you have an Enterprise or Developer license.
So in CF 10, you will only find 2 options : 1.Server configuration 2. J2EE configuration.
http://help.adobe.com/en_US/ColdFusion/10.0/Admin/WSc3ff6d0ea778594611 72e0811cbf363c31-7ff4.html
Thanks
VJ 