Many applications have very confusing menus or simply have so many actions that you can't find the one you are looking for, even though you know it's name.
Therefore I thought a quick find feature would be cool. You just begin to type the menu items name in the textbox. If there are several menus which contain a item with a name containing the searchstring, all are marked.
If the searchstring uniquely defines a item, then the menus are expanded and the item is selected. Then hitting enter executes the action.
I didn't program Qt/KDE before, so I can't quickly implement such a widget. And I do not have time to dig into the matter. So if anyone who has the necessary knowledge thinks this (or something similar) is a great idea: Please implement it! :)