QWizard Next, Back, Cancel Buttons

Here is a quick suggestion that would simplify thousand of people doing QWizard
(Check out by yourself @Stack Overflow and many other forums):

I've been searching a while about how to disable the Next, Back and Cancel Button.

Why would I do that? Look at Adding a printer in Windows 7 (http://img.techtalkz.com/DeviceAndPrinter_Win7_8.jpg)

I'm doing the exact same thing for my current project, and I can't produce that GUI.

button(QWizard::NextButton)->setEnabled(false); // doesn't work

Reimplementing isComplete: How? I have no fields at all, just two commandlinks.

So what I have three suggestions:

1) A new setPage overload, that would have the following signature:
void QWizard::setPage ( int id, QWizardPage * page , bool next )
or
void QWizard::setPage ( int id, QWizardPage * page , QWizard::Flags )
where QWizard::Flags would have an enum with button enable-ing options.

2) A WORKING "button(QWizard::NextButton)->setEnabled(false);" at all time.

3) Or the SIMPLEST: setNextButtonEnabled(bool);

Thank You Nokia!