After having my Amazon Echo / Alexa for almost a full year now, I must say that I absolutely love it! It is used every day in our home. One feature that it is missing is a “manners mode”. I can envision this feature to work with a simple use case; you must say please at the end of every command that you ask the device.
This teaches both children and adults to more polite and respectful. I also want to be in the good graces of these machines if the singularity ever comes to fruition! :)