I'm the author.
So let ME get this straight: I get paid nothing for my work on jQuery, where we clean up behind all the major browsers so that people don't need to wait months or years for bugs to be fixed. We also report these bugs to the appropriate vendors with clear test cases; as you can imagine we get our share of crappy bug reports and don't want to do that to these guys. You would also like me to donate more time to become an expert at Webkit to the point where I can fix these bugs immediately on their side, despite the fact that several major well-funded companies (Google, Apple, BlackBerry, and now Opera) are paying people to (NOT) fix these bugs. Sorry, but one unpaid volunteer open-source job is enough for me.
I would love for all the WebKit contributors to get together and say, "We'll show that guy! HAHA we fixed all your bugs so THERE!" There are rumors, however, that Opera is laying off 200 engineers and I seriously doubt they'll keep a large staff of people on fixing WebKit bugs. I've emailed Peter Kasting privately and think he is sincere in trying to get some of these fixed though.