When database does not exist:
Notice: Use of undefined constant DB_USER - assumed 'DB_USER' in C:\Server\Apache\htdocs\wpqi\installer.php(5) : eval()'d code on line 32
On the install-options step:
Warning: array_keys() [function.array-keys]: The first argument should be an array in C:\Server\Apache\htdocs\wpqi\installer.php(5) : eval()'d code on line 55
Warning: array_filter() [function.array-filter]: The first argument should be an array in C:\Server\Apache\htdocs\wpqi\installer.php(5) : eval()'d code on line 55
On clicking "Install WordPress" on the install-options-check page, the form submits, but the installer does not progress.
(Also, you spelt "Feature Requests" wrong for the forum name. :P)