I have several things not working when I try to install your script. It looks good from the outside but man you make Drupal and others look like the basics compared to your complicated installation.
1.) Never wants to accept my DB info.
2.) "Check that certain classes haven't been defined by PHP plugins Your version of PHP has defined some classes that conflict with SilverStripe's. The following classes are at fault: HTTPResponse"
No I did not change anything.
No I don't have any custom pages. (fresh install)
I use a fery common setup: Apache, PHP5, are experienced.