ADE won't even compile with 113.9. It seems not to be possible to add ATIS.ADE provides a list of frequencies which are accepted by the sim. As far as I know this has list has not been changed. Someone will put me right but I recall that radios would not accept frequencies outside the range provided. If you want to try and change it then you would need to download the ProKey which can add functions to ADE including a direct edit tool called the Raw Data View.
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With this you can change the frequency to any value but you will need to see if the sim will accept it or whether you can actually tune to it. If the frequencies provided by ADE as valid are out of date then we can look at updating them