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How can I add my own field (parameter) to the Preference dialog using python?
If you wish to expand the Preference dialog, you need to program a complete Preference plugin. See this documentation and the linked example:
https://developers.maxon.net/docs/py/2023_2/modules/c4d.plugins/index.html?highlight=preference#c4d.plugins.RegisterPreferencePlugin
Thank you. I will look into it and try it.