First I would like to say thank you for developing this great tool GacekSSJ4. I was thinking of coding something similar to this before I found your tool. So that saved me the time of doing it myself

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There is however a few things I would like to see on the tool that I have thought of so far (As I'm new to this game), which could make it even easier to manage production. Also a bug which I will note below.
Features that could be added:- On the production page it would be good to have a column to see the average production per hour per building. For example if you was making 200 Firwood per hour and you had 10 firwood cutters. The average production per hour per building would be 200/10 = 20 per hour per building. This would make it easier to see how many building you need to add or remove to get your desired production value.
- On the production page again it would be nice to have a detailed overview for each resource of which buildings are consuming the resource and how much per hour. This would help to see where all the resources are going per hour for each resource.
Bug:- On the production page it doesn't show bows in the list of resources
Just one last thing to note is that if you need any help with developing your tool or implementing the ideas I have suggested, just let me know as I am also a web developer. I have developed a few tools in the past for some other browser games such as Travian and The West. Send me a PM if you need any help or just want to chat about the development of the tool.
Look forward to hearing from you.