It could be made so that if you press Shift+Enter or Ctrl+Enter a search term into the search bar, it uses a different engine. For example, I like using perplexity for my search engine because it gives me direct answers. Still, I could also be looking for something specific, and I'd want to use Google, then I have to take my hands off my keyboard, carefully hit the tiny drop-down menu, and switch engines, AND switch back afterwards. It's just too much of a hassle.