So you'd have to download the json of all the forum members usernames in one request?
That'd be pretty slow. Then doing a search through the json data every time someone presses a key would also be slow and intensive. That technique would also mean having to write server side code.
You could extend this idea by indexing any viewed threads against thread id's, then have a quick search to quickly jump to threads you've previously viewed by quickly typing part of the name of it.
I'm pretty sure sqlite allows fulltext searching.
Mmm. Well I was thinking of it as a small enhancement which is pretty quick and inexpensive to implement.
Dunno. Was just a suggestion :) Could be nice to enhance things with gears here and there.. such as the multiple file selector and whatnot.