I'm with you (you run a great engine BTW) and I've considered the UX of some attempts to help users do this. I like Firefox's UI when searching, where you can

I'm with you (you run a great engine BTW) and I've considered the UX of some attempts to help users do this. I like Firefox's UI when searching, where you can select the search engine of choice while typing a query. I like customizable metasearch engines like searx, I think it is a phenomenal idea. I wish more niche engines would implement OpenSearch so that they could easily be added. I have considered just making a simple web page with search boxes for multiple engines for personal use as a default home page, but there's friction and again, lots of engines I'd like to use don't implement OpenSearch. I wonder if there's some novel UX approaches to this out there. Meta search engines seem to be the best way so far to do it but there's the problem of customizing ranking, relevance of results and the like that just compounds the problems users experience.