Version: 4.7 (using KDE 4.7.2) OS: Linux Setting Control+Shift as main layout switch shortcut causes it to overlap any other shortcuts which use those modifiers (like Control+Shift+C/V). Apparently, this happens because KDE Keyboard Layout Switcher reacts immediately upon matching the key sequence on key pressing. If I may, an obvious suggestion would be too make the layout switcher more "patient" and wait for key release signal to ascertain matching of key sequences. Reproducible: Always Steps to Reproduce: Set Control+Shift as main layout switch shortcut and try out any Control+Shift-based shortcut. Actual Results: Layout switching. Expected Results: Execution of action bound to the longer shortcut.
It's known problem, but unfortunately it's the problem in x.org and not much KDE can do about it (I personally switched to use Menu button for switching layouts because of this problem). The x.org bug report is here http://bugs.freedesktop.org/show_bug.cgi?id=865