Bug, feature request, or proposal:

Change the ripple config for all buttons for example

What is the expected behavior?

What is the current behavior?

What are the steps to reproduce?

Providing a Plunker (or similar) is the best way to get the team to see your issue.
Plunker template: https://goo.gl/DlHd6U

What is the use-case or motivation for changing an existing behavior?

It prevents using css hacks and it's possible to fine tune the ripple for all elements for a certain type

Which versions of Angular, Material, OS, browsers are affected?

Is there anything else we should know?