It's great that you provide a PDF of the flag as a starting point for folks who want to contribute their own icons. But, if we are trying to make new icons that fit into the existing sets, it would be handy if you offered the PDF templates for some of the more common "shapes" that we might use. i.e.:
I'm not suggesting you give away the source vector files for everything. But if, for instance, I really wanted to offer an "icon-circle-chevron-xxx" series, or an "icon-somesocialnetwork-sign" I'd be able to use the above templates to make sure everything matched with the existing set.
I'll think about it. But in all likelihood, I won't be taking contributions after 3.1.0. Took a lot more time to manage submissions than I got out of it.