This is a collection of rulesets for Policeman Firefox add-on (it's about cross-site requests control).
Ruleset is a thing that can decide whether a request should be made.
Just go ahead and create a new issue, describe what you'd like to be blocked or allowed.
There is no comprehensive guide yet, but you can get the idea by reading this comment and some examples in this repo.
Issue a pull request, create an issue with a gist or simply email it to me.