I'm going down this route because I tried to use the LocationServer.xml method to select a DeployRoot, but the issue I ran into is that the UserID and UserPassword are no longer read from Bootstrap.ini if I do this, at least they aren't for me. I am using a UserExitScript to decrypt the password so I'm not storing things in clear-text in the INI files, so not sure if that script no longer get's processed if I don't statically assign a DeployRoot, but my solution is to try and use the DefaultGateway section.