Some way to toggle between either a bang and searching the web since the former relies on the site’s search capabilities. Example for a bang would be !imdb Deadpool vs Deadpool site:IMDb.com
I have dual searches setup for those without bangs as well, say https://forums.plex.tv/search?q=%s for the Plex forums directly and another for https://kagi.com/search?q=%s+site:forums.plex.tv.
Usually the latter returns more/better results than the former. Bangs are only as decent as the direct site’s internal search.
Usually bangs are great for going to directly/near what you need but if there’s any variation, they become less and less useful. Having a way to toggle them into an “integrated bang” would be nice, like the Plex forums about. Say !pf directly for the Plex forums and !pfk for a web search of the site.