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There are scripts for spirals, that could be modified, but it may also be possible to directly script ARCs - ie run on a loaded design, via Python.
You can bend as a series of angled lines. Getting angles other than 0, 45 or 90 on the OpenGL canvas requires diving into menus.
The problem with curved tracks created with many line segments is that they do not play nice with the interactive router, so that they do not drag or shove.
I think you can't do it currently.
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