Application Launcher and Overview have KRunner search, Application Dashboard should too. It already has some things (like calculator and bookmarks), it should have it all.
This seems reasonable to consider
I'm not completely sold on this one: there are many launchers that are text-heavy and that won't really work in the dashboard icon+quick description format. Take, as an example, the dictionary runner. What should be do there?
*** Bug 439744 has been marked as a duplicate of this bug. ***
Agreed, I think we'd have to switch to a list view to display arbitrary KRunner results. That's what Kickoff does. We could perhaps shim in the Milou results view and just increase the icon and text sizes a bit.