Awesome :) Mind also crossporting the query variable fix to release-1.5.x? I want to get the API super stable on that branch.
Fix autocomplete drop-downs for users and groups.
Review Request #2018 — Created Dec. 28, 2010 and submitted
Fix autocomplete drop-downs for users and groups. This change fixes two problems with the autocomplete drop-downs. First of all, we were using the old API path, which worked fine except didn't do any local-site filtering and won't work when we turn off the old API. Second, the /api/users/ resource was using "query" instead of "search_q" in some of the LIKE relations, which created a complex query that promptly raised a mysql operational error.
Autocomplete works on rbcommons.com (including filtering out invalid users).