could you use IIS integration in VBldPro ?

Why not use JScript action to do what you want.
You can pass Visual Build variables into the Jscript to make it more dynamic.
See the attached file as an example of setting up an IIS application.
Oh yes, the Macro %VIRTUAL_PATH% has
"C:\Inetpub\wwwroot\P1\P2\Application" stored in it. (Just in case you can't figure that out.