PR is a pull request on GitHub.
I’d say this particular problem is of the type that it would sit around awhile (unusual use case, really sensitive area of code, hard to test).
Documentation fixes are usually merged quickly. Just a quick look around the Bugs topics here and some issues on our JIRA:
This is mostly removing stuff:
scalaConsole problem
This looks kind of straightforward, I think (check out FilterChain):
https://issues.gradle.org/browse/GRADLE-3122
This is a little more involved (Lorant had a PR last week for it, but it broke other things):
https://issues.gradle.org/browse/GRADLE-3329
Honestly, answering some questions on the forums is really helpful too.
Would you be working on Linux/Windows/Mac? Would you be interested in fixing things related to native (C/C++) builds?