But I don have IIS installed, how can I use AppFabric (there is no AppServerExtensions for .Net 4 UI). And isn’t AppFabric hosting without IIS just WAS?
You can use appcmd.exe to configure your web application instead of the IIS MMC. In that case you don’t need the AppFabric UI. When you run the Appcmd.exe tool, settings are updated in the %windir%\System32\Inetsrv\Config\ApplicationHost.config file. You still use the WWW service and WAS since they are a part of the OS. But there will be no AppFabric UI since there is no IIS UI if IIS is not installed.