Maybe I am heavy-handed, but I have always had a problem when typing on my laptop of the cursor jumping to another part of the screen, and so my typing continues at that point. This is caused by sensitivity of the Synaptics - a merest brush of the touchpad whilst typing results in a mouse tap event.
Thankfully, this can be cured very easily with the syndaemon command. This disables mouse taps for a specified amount of time after typing finishes, with a default setting of two seconds. The command to run during a KDE xterm sessions being:
syndaemon -d -t