I have one suggestion that, if implemented, would perfect the app in my opinion. I suggest an option to save search presets in the list, even when history is off. So they would be sort of like bookmarks for our common search queries.
For example, if I want to keep up on news about Linux through YouTube, I could save a preset/bookmark in my list as "!yt linux" with Simple Search set to use Duckduckgo. Then whenever I open Simple Search, I could just click on that and it will quickly pull up results of Linux on YouTube without me having to type it again. Or I could save a shopping query for quick selection like "!az mailer packages".
From an e-mail I received: