Editing numerical values a spinner is needed only in very rare cases. In places, it adds complexity to the layout. Now I turn it off all over the place. I can turn it off globally with styles. I can turn it off globally with styles, but I'm not sure if this is a good practice. Sometimes it may be required.
You have not considered the possibility of turning it off by default, but turning it on as an option?
No, we haven't. If you want to disable it globally use CSS or set the corresponding property to false.