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I've had success removing shading errors in SP with this Vertex Normal Tool.

Inspired by the request from this thread: https://www.core4d.com/ipb/forums/topic/109564-selecting-uv-seams I have quickly created a plugin which does detect the UV island boundaries and turns them into edge selection. The plugin will process all selected polygon objects. UVisland Outliner v11.zip

I have updated the plugin to provide an option (via cog wheel) to ignore the outer edges of an open-ended mesh as being detected as UV boundaries. In general you would want to turn all UV seams into edge selections. In case of open-ended mesh objects, the mesh boundaries would be detected as UV boundaries ... while these aren't actually UV seams. The new option will (by default) allow to ignore these boundaries. On the other hand you might want to turn all UV island boundaries into edges, no matter if these are UV seams or not. You can do so by unchecking the new option. This is the behaviour of the original version 1.0

I had provided a quick plugin which does select UV boundaries, inspired by the thread you had started about this topic. Isn't the plugin useful in your context? If it does miss some functionality, you can discuss your specific needs in this topic: https://www.c4dcafe.com/ipb/forums/topic/109930-uvisland-outliner/