The other day I remembered a feature from another editor (Komodo Edit/IDE) that I can’t recall really having seen anywhere else (but it probably exists somewhere) that is really nifty. Basically, for searches, you can chose between ignore case / exact case / smart case, where the fancy stuff lies in “smart case”. Basically what it means is that your searches will be ignore case until you insert at least one upper case character in the search string, then it’s exact case.
I think this could be a great addition to the search field and probably also to the Ctrl+P (open file in project) widget.