While there are a lot of modules in this package, since the common interface is very simple from a type system perspective I think it would introduce little to no additional maintenance burden to include type hints and the majority of the initial hints could be added automatically for the common interface using something like sed or awk.

If there's any interest in maintaining inline type hints I'd be happy to create a pull request, if you'd rather not, I can go the typeshed route instead. I've already contributed type hints for various third party packages including Chameleon, WebOb, WTForms, uWSGI and gevent, just to name a few.