Scenarios can't be parameterised
It would be cool if one could attach a table to a scenario and have each row be a set of values for parameters to the scenario. For example, the scenario could do an HTTP GET request to a URL and check that the status code expected. The URL and status code would be parameters, and the attached table might have many rows with different URLs and expected status codes for them.
Markdown has ways of expressing tables, or we could support reading a separate CSV file.