Annoying Disappearing Windows

[Peter Gueckel]

Background (to frame the quandry):

In KDE, when you go to a website using firefox, the master password window 
appears on top of the main firefox window and it stays there, no matter 
where the mouse pointer happens to be, and it waits until you enter a 
password or cancel the password entry window. This is highly desirable.

However, when kmail is opened, the kwallet window briefly appears and then 
immediately slides behind the kmail window, unless the mouse pointer 
happens to be positioned directly over the newly appeared password entry 
window. This is a real nuisance.

Question:

How can I get the first behaviour as a default behaviour for all appearing 
password entry windows (or other windows that require input before the 
application canbe used)?