How to set globally a tag?

Hi,

I've got a simple question.

I'm developping a package with a lots of classes whose attributes are traitlets. All of them use the tag `sync` like this `x = Unicode().tag(sync=True)`.

Is there a way to set the `sync`tag to True by default for the whole package? This would prevent me from making an error and the code would be much more readable.

Thanks for your help