KDE can emulate Mac OS X shortcuts, Windows, Unix, and WindowMaker, and it has its own shortcut schemes based on having three or four modifier keys.
The text file with the Scheme is saved under ~/.kde/share/apps/kcmkeys, in case you want to transfer your shortcuts to a new system.
To get to the KDE Control Module for shortcuts, go to the KDE menu and select Settings -> Regional & Accessibility -> Keyboard Shortcuts. Once you're in the module, you'll see tabs for Global Shortcuts, Shortcut Sequences, and Application Shortcuts under the Shortcut Schemes tab.
Global shortcuts and shortcut sequences