What I'd really like is temporary whitelisting a single domain. Just because I need to use site X for a couple of minutes it doesn't mean I want the flood-gates open.
Wouldn't you have to whitelist multiple domains (30+ for theguardian.co.uk) for a feature like "reload without blocking"?
This is more for the case when a single JS file fails to load from a CDN or things like ReCaptcha.
Since it's an API, even if it would have been 30+ those could all still be approved with a single script call.