Hi Patrick,
Not to discourage you from pressing for fixes, but 9 times out of 10 I have to just end up forking
open source projects to fix bugs and then just use my own fork. This is the fast path.
Perhaps you've already intuited this. Just to let you know you aren't alone in the experience.
Often the best you can do is to post a link (say, in an Issue on the original)
to your fork with fixes so others can find it, and maintainers can pull from
it if/when they get to it, and move on to more interesting work...
This is the beauty of open source at work.
Best wishes.
Jason