Okay, I think you’re saying that if kiwitrees was English only, strict date entry used, it’s possible. That part I wasn’t sure before.
Was hoping to reduce overage searches. When I want births before 1916 (cutoff for Ontario), +/- 10 gives me up to 1926. Going higher just takes more searching and produces more unwanted results. Of course, searches for other provinces/countries differs based on release date laws.