Configurable self-test domain to avoid drupal_http_request() failures in status report

HTTPRL produces a long error message on the status report page (admin/reports/status) if it cannot access itself (in time) on the site's domain.

The message is: "HTTPRL - Core drupal_http_request() Your system or network configuration does not allow Drupal to access web pages. This could be due to your webserver configuration or PHP settings."

In many cases this is a false positive. Eg when using Domain Access, the status page may be showing on a domain HTTPRL has no permissions to access, but work well on other domain(s) that are public.

Is there / will there be a way to override the self-test URL for sites using Domain Access, or in general?
Or perhaps, is there a simple way to switch off the self test by admin?