Fantastic idea. I see humans.txt (http://humanstxt.org/) was an influence. Why not stay in a concise format like that?
For example, I've not a clue yet on how to improve on this example:
Feature: DuckDuckGo Search
It should continue to kick ass
And I should be able to search
Scenario: Homepage performance
When I go to http://www.duckduckgo.com
Then I should see the page downloaded in less than 0.5 seconds
And I should see the page assets downloaded in less than 2 seconds
Scenario: Search over SSL
Given I go to https://www.duckduckgo.com
When I fill in "q" with "site:news.ycombinator.com"
And I press submit
Then I should be on https://duckduckgo.com/?q=site%3Anews.ycombinator.com
And I should see "Hacker News" within "h2" Then I should see the page downloaded in less than 0.5 seconds
to Then I want the page to download in under a second.
The natural English looks very tempting, but the actual terms you can use are very restrictive.