This basic selection of curl switches has been implemented, but nowhere near all of them:
File an issue if you need one that's not implemented.
Additionally, these switches are supported and/or work differently from regular
--html: Render the output in HTML format. My primary use case for this is getting colored output into my clipboard like this:
swirl --html -v <url> | xclip -i -selection clipboard -t text/html
--plugin <path>: Install the given Unexpected plugin
-v: Dump the entire request and response, even if the expectations aren't met. "In spirit" this is the same as
curl -v, but the format is quite different