No amount of README pleading, CONTRIBUTING.md or issue templates can stop the class of people which don't read and don't care. If you open an issue on my project, at the top, you'll get a message explaining that, as shocking as it may be, "debugging requires information." Then there's a checklist of 5-6 items which are the bare minimum required for me to start debugging this app which runs on numerous operating systems and platforms.
Despite all of this, about 20% of all issues ever opened in the project have blanket ignored the expectations of the project. The coding part of open source I still love. The administration of the project, and endlessly begging people to follow the guidelines, necessitates occasional sabbaticals to recover my sanity.
No feature requests: Author(s) do not wish to "politely refuse" every wild idea you might have.
No Support requests: Author(s) do not wish to "politely refuse" every time you need hand holding with your implementation of hello world.
No Pull Requests: Author(s) will collaborate within a restricted group and do not wish to "politely refuse" your t-shirt contest contributions.