The license means you don't have to research (or survey) as such, but you are still obliged not to interfere. As an example of interference, last year a friend told me their weather station wasn't working, their door bell seemed very insensitive, and a panic button had to be held within two metres of the receiver before it would react. It turned out that the outside transmitter for the weather station had water in it, which caused it to transmit continuously, and that was reducing the sensitivity of everything else on the same frequency. Like someone yelling when you're trying to listen to a whisper.
Yes, it is easy to change the code; it is all available for download and use. It might not be easy for you if you've never done it; just take it slow and careful.
Yes, I could help with code; for a price; I'm a professional coder. But that's probably not what you meant. You can probably work it out yourself given time and a few questions and answers online.