I'm a new user in this forum, so I don't know if this subject can be in this thread. If not, please excuse me.
Well, I've been using SUSE for two years, and I like KDE, but I think there's a missing feature in KDE SYSTEM GUARD: I can't kill a process started by root, for example ZMD (when I was using it). I suggest a prompt for root password when someone wants to do that.
I think what you're asking for will be a feature in KSysGuard for KDE 4. If you try to kill a process owned by root, you will be prompted for a password. I'm really not sure though.