You can snub it if you want

but I run in the same circles as the developer of this extension since I was 14

and so my experience makes me a realist and a pragmatist bordering a paranoid pessimist, occasionally morbidly so.

But facts, in ALL my life, I have never had a virus infection, malware, trojan, I get less than 20 pieces of unwanted email per month for 18 email accounts, never had any type of account information for anything compromised, or even ever lost my keys, watch or wallet.

Although by nature I try to see the good in everyone, I follow the policy of trust no one, suspect every one until proven otherwise. Not trust everyone until they screw you over. Kept me alive as a Marine and served me well as a hacker and hopefully as an attorney. Hopefully that answers the first part of your post.
Now back to the technical question at hand, the temporarily allow all sites was intended to mitigate some non-techi user frustrations (seeing webpages suddenly not looking right or working, giving them no less protection than they had before while they get acclimated) and the allow globally is basically turn off the blocking I know what I am doing (therube's version of I give up button). What you are suggesting, although I understand perfectly where you are coming from and situations where that would be useful, it could potential cause great harm if misunderstood, or misused by giving a false sense of security and introducing complacency by the users which is security death. The implication is that if you trust one site, everything coming from that site (linked on that site) is also safe and regardless of how I feel with the circles I search, you must admit that is logically flawed. Let's try the inductive reasoning: Wine is a spirit, champagne is a wine, therefore all spirits are wine.

Now another problem with, let's not include search engines in this, is that there are more search engines out there than Giorgio can be expected to include in his exception list to make sure links from it are not processed. We don't just have google, yahoo (now bing), msn (now bing), live (now bing) to contend with. There are international versions, other personalized or specialized ones and so on and so forth, the list is virtually endless.
Now all that being said, I can see a possibility of the feature being provided as a "use at your own risk" with responsibility to place exclusion engines (ie: google, this and that) on the user, basically the user needs to decide what WON'T have its links trusted. This would suggest a huge architectural modification and addition to NoScript, so not sure it would be something the professor would want to tackle given higher priority items but should he do it, then I am all for it and I am sure it will make someone happy, like you.

Hope you won't take offense to me adding my two cents and maybe Giorgio will have a different perspective on this that I am missing. Cheers.