It’s not hard to think of obvious improvements to it. It would be nice if it was open-source and perhaps even maintained by community members that would accept improvements.
Or is the technology it (at least partially) is implemented in, this XAML thing, unpopular and obsolete, and very few people would both know it and be Flight Simulator add-on developers? I personally at least have never used XAML. But hopefully for small improvements to the app one wouldn’t need to know it too much in detail. C# I have used a bit in the past, it is not a very obscure language, that is not a problem.