Vocation scrolls and weapon manuals MUST be carried to benefit someone. Those that give passive benefits (example: Thief's Theory) work just by being carried; ones that confer skills (like the wand manual, for Zing Stick) add the skill to your list just by being carried.
Of course, this means that only one person can benefit from each (I know of no way to obtain duplicates).
However, you can load people up with scrolls and manuals - each item may only be able to be held by one person, but nothing says a person is limited to only holding one of these items. --- "As the good archmage often admonishes me, I ought not to let my mind wander, as it's too small to go off by itself." -Danilo Thann