We don't have specific people that do parsing; if your feature needs changes to the parser, then you make those changes.
One nice thing about using recursive descent, is that your parser "is just a normal program." It's also a potential problem, but every substantive project needs coding standards anyhow.
I guess 12 or more poeple are on the new keyword team, always ready to jump on a new language feature added. After all it happens every 3-5 years.
Adding a new keyword to a parser is a huge work, even tests need to be written!
hint: irony
The best part about going open source was being able to outsource the bikeshedding discussions to the community!