Create online installation.

[eluser]Michael Wales[/eluser]
You'll also have to dynamically generate the base_url in config.php, possibly change the URI_REQUEST, at the minimum.

For full support you'd need to offer a way to change the index.php file to support a system folder outside of webroot, the encrpytion key, the log/cache folders.

It's a thought I have had multiple times... would definitely be a worthy addition to CI.