Comment 11 for bug 111232

 KasimirK solution works great, u don't try to use autostart script for disabling touchpad
(script in /home/user/.kde/Autostart with /usr/bin/syndaemon -d -i1 - disables touchpad while typing).
The problem is that with this script i could not get kmix tray icon to show up automagically in tray after restart/reboot.
The solution is to modify the above script by adding sleep 10 before syndaemon.
Hope it helps somebody (it drived me crazy to change volume by keys...)