Great idea, but I find that in order for this script to work on your test page, I have to change my NoScript settings to allow scripts from your homepage to run. No offense, but I don't know you any better than the malicious people I'm trying to protect against.

Also, given that there's such an easy workaround as noted in previous comments, and that userscripts.org already screens scripts to some degree, the safest and easiest solution seems to be to just download scripts from us.org and other trusted sites.