First of all, thanks for contributing, thinking about contributing, or even arriving here by mistake.
Issues are reserved to mention a problem, a bug or discuss about implementing a feature. If you have any question or support request, please use Gitter. For every issue, please try to give as much information as you can, especially the steps to recreate it and the browser you're using.
About pull requests, please try to contact the maintainer beforehand. He's a kinda human Grumpy Cat trying to avoid features which can be useful for only 1% of users. The warning is only because it would be sad to see contributors spending time a feature that wouldn't be merged. Otherwise, I would recommend you to add a section in the hacks.md file. But if it's a bug fix, the chances to be merged are higher. If necessary please think about updating the tests.
Least but not the last, bad behaviour is not tolerated, let's keep it a happy place. So do not post uppercase messages, respect each other, do not impose your views but communicate and try to understand other point, remain polite, and don't pretend to be smarter than everybody else.