[Bug 36007] Re: kdesu doesn't remember the password

[Raphaël Pinson]

Actually I'd say more : kdesu is not made to work with sudo iirc.  The initial role of kdesu is to use ... su! So it would either log you as root by default or allow you to launch a program as a different user. 

Kdesu has been patched in Kubuntu in order to use sudo instead of su, but it is not made for it still. It should indeed be a great idea to have it support sudo natively, or develop a kdesudo as their is gksu/gksudo.
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kdesu doesn't remember the password
https://launchpad.net/malone/bugs/36007