KActionRunner is a class that has a KRunner like behavior for the actions in a KActionCollection.
The idea is that if a user knows what he's looking for, it's much simpler to write part of the name of the action in a text field and execute it, instead of getting lost in menus.
Quite a few applications in the KDE Sc could benefit from this, as it would simplify enormous a few layouts.
also, this is a WIP, I'm interested to see if this could be wanted before investing more time making it.