I'll just leave this here and back away slowly...
Good luck to you.
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Accelerationism
The piece of software you're asking about is KRunner, but I don't think editing existing entries is supported. It's possible, sure, but it's probably a bigger mess than you'd like to deal with.
I would just make a shortcut to the shutdown action and let it populate in the results, then just use that to trigger a shutdown. Or I suppose you could make a quick keyboard shortcut.