Allow automatic pass-through for authentication / restriction.

It would be great if we could link to FeatureUpvote from within my own SAAS application, allowing my own trusted / authenticated users access to FeatureUpvote, whilst preventing the general public access. (rather than using a password)

This could be with a post / key / token or maybe a check on the HTTP referral address and only allow if it came from a specific website.

Maybe as a quick way around this (although not 100% secure), could we simply be able to send the restrict password as a GET parameter, as it would quickly deal with the majority of public views unless an authenticated user was to pass on the link.