I must apologize to Bax. Bax I am sorry, you are correct dual elevators is called Ailevator and that apparently corresponds to the JR10X question by MaxMotoring.
I guess I wanted to do a little bragging on the 14MZ and show MaxMotoring other options.
What I should have written is there is at least one other choice than "Ailevator". With the 14 MZ, you can simply choose "Normal" tail and in the function screen assign "elevator", typically CH2 and "elevator 2", any other unused channel. I have this set up currently and just for fun went and checked it out on my plane to make sure I wasn't giving bad info. I am quessing there are more ways to program two elevators, this is the one that I choose.
I have a 14MZ and am amazed at the programmability and versatility. Not to mention that it plays MP3s

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Just upgraded my 14MZ to 2.4ghz and am exited to fly.
No hard feelings, Bax you are still the man.
Bill