You can file this under 'blue skies thinking' (or possibly 'pie in the sky thinking'), but having a tab that was completely programmable would certainly make alt.binz unique. That is, a tab that could be pointed at any search site, with a simple scripting interface for processing search requests, results and actions. It could be something that would help to increase the longevity of the programme without a constant need to compile a new version when a site changes something.
It's probably completely impractical, but then again I'm not sure how much plumbing is needed behind the scenes to implement the current search engines in alt.binz (a lot, I'd guess). I'm curious to know a little more about how you do it, anyways.
-Hecks