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.