Why QtCurve style doesn't have "Configure" dialog ?

[Yuri]

I have kde-4.10.5 on FreeBSD 9.2 installed from ports.

In the configure screen "System Settings"->"Application 
Appearance"->"Style" I select QtCurve. But "Configure" button is 
disabled for it.
There are several QtCurve styles designed by people like this one 
http://kde-look.org/content/show.php/BlueSteel%2C+a+QtCurve+Style?content=161003 
that suggest that one can add such style using this "Configure" button 
for QtCurve.

So why this button is disabled?

qt4-style-qtcurve-1.8.14

Yuri
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