When I Branch from Trunk I need to create a new Virtual Directory. Anyway around this?

Question

the Trunk of my app points to

<IISUrl>http:///localhost/MyApp/&lt;/IISUrl&gt;

Whenever I create a new branch, I end up having to edit MyApp.csproj to change the target URL to

<IISUrl>http:///localhost/MyAppBranchName/&lt;/IISUrl&gt;

Is there any way that I don't need to do this? The reason is the number of branches are starting to add up and there's a lot of virtual directories in IIS. I suppose I could use the ASP.NET Dev server, but as this solution is already configured to use IIS, I'd prefer to keep using that.