I've had some issues with feeds that I Trust that I want to give fairly creative output to - i.e. I want to include html tags that actually get parsed, or javascript. A simple solution that I used was to update the item_cleanup function:
I moved the "some cleanup for security" section below the "apply opts, if given" section, and wrapped it in:
if (!isset($bypasssecurity)) {
}
So, now if i have a feed that I TRUST, I can just [opts:bypasssecurity].