Including MIT Licensed SASS/Compass Gems in Drupal GPL Licensed Themes/Modules

As more and more themes(and to a lesser extent modules) begin to incorporate MIT licensed CSS resets and Mixins libraries. Although the majority of the libraries (Gems) vest on the dev-box, there is a need to include large portions of them in themes in many cases.

I've read discussions on the change in the JQuery license to an MIT one, and also the various aspects of Symfony which are also MIT licensed.
However, although the MIT license is permissive and allows sub-licensing, we are required to include a copy of the original MIT license with our derivative work.

I was wondering the following:

1. Is there any concensus on where we stand regarding this mixing of MIT licensed code with our own GPL code.
2. Are we free to include MIT SASS libraries at will.
3. I have not seen many MIT License Files includied in other projects, but I suspect we should include them?