How do I end dictation without using my mouse, and without triggering unintended shortcuts?
It's currently not possible to close dictation using voice command. From Apple page: http://support.apple.com/kb/HT5449?viewlocale=en_US&amp;locale=en_US


  When finished, click Done or press the fn key again. Your spoken words then appear in the text field.


The same is for Enhanced dictation


  Enhanced Dictation automatically stops listening when you switch to another window, or if you press the Fn key again, or when you click Done.