Yes, it annoys me too! Heaven knows why it doesn't use the system settings. This was entered into the IdeaStation way back in 2014 but unfortunately it was archived so I've been unable to vote for it. Perhaps it should be added again and hopefully it will get enough votes! There must be thousands of non-US users out there who want this.
If this answers your question please mark the thread as solved as it can help others find solutions in the future.
Marcus Wakefield
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I've created a Windows application (and now Mac as well) for creating custom thread files for Fusion. You can find out about it here. Hope you find it useful.
If you need to know how to offset threads for 3D printing then I've created a guide here which you might find useful.
If you would like to send me a tip for any help I've provided or for any of my software applications you've found useful, you can do this via my Ko-Fi page here.
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