As other posts have said, it doesn't look like barewords as hash keys are going away any time soon.
As long as everyone knows when they must quote hash keys, then I wouldn't make a big deal out of it.

If you can persuade everyone to use/agree on a set of coding standards and style, that's a good thing. It isn't always easy though.
It my experience, things like quoting hash keys, bracketing/brace styles and the like aren't worth worrying about - concentrate on hassling/convincing your colleagues to build well engineered, robust, easily maintained code and let trival style issues slide.