There's the "OpenSearch" protocol, which just tells your browser "to search this site go to [someurl]?search={SearchTerms}" SearchYC could certainly add this, though I think it may be limited to 1 search only, and not something like: "I have two types of searches, one for everything, and and another for users."

But beyond that, OpenSearch it's pretty limited. I expect this area of semi-semantic searching to explode, which is why I'm investing my own time into it.

So, hang tight for a couple of weeks, then the problem will be solved :)