Previous versions of CF installer allow you to install either server or multi-server configuration.
This made it hard to change a CF box from server to multi-server since you would have to re-install CF to apply change.
CF10 installer lets you install stand-alone installation. After installing ColdFusion in stand-alone mode, you can create multiple instances (provided you have an Enterprise or Dev license).
Nice. Easy to alter a CF box from server to multi-server.