More granular per-site Shield controls - allow saving per-site whitelist for scripts

Is it possible to implement more granular per-site Shield controls?

There’s a site where I’ve blocked all scripts, but I want to allow 2 of them. If I click through to see which scripts are blocked, I can allow those 2 scripts, but the only options is “Allow Once”.

Basically it’d be great to have an “Allow Always” button here to retain the whitelisting of scripts long-term. At the moment it literally just allows them once - clicking any links on the page, or hitting the back button, blocks any “Allowed” scripts again.