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In the Kwin settings, I would personally find it useful if there was a checkbox on some effects that would generate a launcher for that action in the menu system. Not all effect would make sense of course, but the window management effects for sure and some others too.

When the toggle/checkbox is unchecked, the menu item would disappear.

This would allow a versatile way to launch actions. If they wanted to launch through the launcher or krunner they could, or if they wanted to drag the icon onto the desktop or a panel they could.

Of course, work would probably have to be done and making icons for such actions, but that's not completely vital and it's a different conversation all together.