Version:            (using KDE 4.0.3)
Installed from:    Ubuntu Packages

From looking at the window, krunner has two parts - an edit line and a results list.
But what looks as an edit line actually is a dropdown list that contains "recently typed" results.

Currently, to run some recent command i have to: 
 * type the text, 
 * press esc, to get rid of the recent commands list (and if you do it too fast, the whole dialog is dismissed),
 * press enter to run the command.

Let's make it better by making the recent commands appear in the results list.
And make it easy to navigate the results list (more like in a dropdown list):

* pressing down arrow (or tab) goes down from the edit line into the list.
* pressing up arrow from the top list item takes the focus back to the edit line.
* typing while in the list, brings you back to the edit field.