Thanks for the feedbacks!
Looking at repost, I can see that there is definitely a place for an HTTP runner/tools that can do asserts on response.
For your suggestions, environnement variable support is certainly a good feature (actually, we can inject variable in the command line ex: hurl --variable user=dude file.hurl). Including another file is also a good suggestion. Currently we write tests by hand or sometimes generate the Hurl text file when we want to reuse steps, but a build-in support is a good idea.