Emmy cheats?

If this has happened before, I have not noticed until now: that cancelled drama series can compete a in different category for awards? Take Missing (2012) and American Horror Story (2011) for example. If they had their ways, and the money was there, wouldn't the producer have made that a long running series?

Don't get me wrong, I liked American Horror Story, a lot. If I have to guess, it certainly had the ratings to keep it going. But the point is, it wasn't meant to be a mini-series to start off with was it? Didn't they write up Tate's evil spawn just so they could continue the plot if they had to?

I think that's cheating.