wix-iisextension

My web application typically will be installed to use applicationPoolIdentity: <iis:WebAppPool Id="MyAppPool" Identity="applicationPoolIdentity" Name="MyAppPool"/> but I have a class of users that will want to use a specific domain user instead, which I would typically author like this: <util:User Id="MyUser" Name="[MY_USER]" Domain="[MY_DOMAIN]" Password="[MY_PASSWORD]" CreateUser="no"/> <iis:WebAppPool Id="MyAppPool" Identity="other" User="MyUser" Name="MyAppPool" /> Making the user interface for this is simple enough, but is there a way to conditionally switch between Identity=