In KDE 3.5.10 there is a check box named "Keep password." The password is kept for the current session only, and only for a limited period during the session. The check box does not serve the purpose of storing the password forever or past the current session.

> As for 1., it is perfectly normal behavior that kdesu can't
> remember your password (otherwise, you would switch to root
> without being asked a password).
> --Regards
> 
> Le Sun, 12 Dec 2010 04:52:20 +0100, Darrell Anderson <humanreadable@...>
> a écrit:
> 
> > Some things I noticed when using kdesu to open Kate.
> > 
> > 1. In the password dialog box there was no check box
> to remember the password.
> > 
> 
>