I had a chat with Asa, and he promised a post to frame the discussion here.
Being totally dizzy from my flight, here's the quick round-up:
We're trying to experiment with people search here.
If there may be something better than the plugin we ship in en-US for
your locale, take the time you need to figure that out, and file a bug
about it. CC me, I'll make sure the right folks are on it.
If you want to tweak the twitter search, you'll need a bug, with a
patch, and that patch will need review before it lands. If you're
tweaking twitter and land without prior review, we'll ship your old
locale status. Getting tweaks to the experience in shouldn't be a
problem, but we need to do that right.
If you just want to add twitter like en-US, just add a line with
'twitter' to your list.txt. Don't add the xml. You may want to wait for
Asa to frame the thinking, though. I'll post-hoc review that as part of
the sign-off reviews.
Axel