Version: (using KDE 3.5.8) Installed from: I Don't Know OS: Linux You now that problem: just by accident you turn caps lock on and realise that after few word are written. Sometimes it turns me mad... But there is solution - you need to double tap caps lock to turn it on. There is link from lifehacker: http://lifehacker.com/373177/neuter-the-caps-lock-key-with-handicapslock
The keyboard is handled on the X level, not by KDE, I suggest asking X.Org developers for such a feature.