The problem with the search facility on Q&P and I daresay in other cats too is that it only brings up a few questions you can click on to see any answers and then it just goes to pages ..pages and pages to wade through.
Also LottieAnne there are so many publications with crosswords that unless they had someone who is absolutely hot on knowing what comes from where I don't think it's feasible .Also people post in Q&P with no headings .Eg... it could well be an RT clue ..but they will just head it "Cryptic" so an administrator would have no idea which crossword it came from. As you can see they can't differentiate between Times and Radio Times as it is !
Do what everyone else does ..instead of wading through reams of stuff just post your Q ....someone will answer it !!