I don't know the best way to do this, but I'm thinking a checkbox somewhere near the search bar, or perhaps a prefix similar to "g!" that'll enable it for any further text that's entered, or something along those lines.
http://donttrack.us directly acknowledges that search queries can be used to personally identify individuals.
I therefore understood from the later statement on that site, "[ddg doesn't] store any personal information at all", that this would include search queries: ddg almost literally advertises itself on the fact that it doesn't save search queries. (According to the small print, I understood this wrong.)
It would be a shame if your explanation was the correct one.
For example, say I start to type "movie t", it'll see that often times after the word "movie", "times" appears at a high frequency so that could be one of the suggestions. I don't see how this introduces a privacy issue unless they are saving the searches by some personal identification number (whether thats an ip, user id, computer, etc), which they specifically deny. Without the specific identifier, there is no way to say it was user A who searched for "movie times" 300 times in a row and not 300 different users searching for "movie times"
But I want to point out that doing a standard ddg search gives me `https://duckduckgo.com/?q=seattle` , which is a GET command, visible across the entire network as it percolates through, unencrypted.
To state it simple terms: HTTPS protects the URL and all the contents of the connection, but does not protect the fact that you're connecting to a particular domain, the duration of the connection, and the volume of data.
I don't follow that DDG not being able to save anonymous queries disregards their stance on privacy?
Surely for the best experience you'd want DDG to do this anonymously.