Advanced Properties for IIS Application Pool

Hello,

i want to write a Setup which will also install a web application.
Installing the Website and also a custom ApplicationPool in IIS is running fine so far.

Now i want to set advanced properties of the WebSite and the ApplicationPool
For example, i want to set the StartMode of the ApplicationPool to AlwaysRunning.
In InstallShield this property is missing.

How can i set advanced properties of the ApplicationPool or the WebSite?

Thank you in advance.