hmm, we do and I did think about that.
The reason we'd like them directly on the iPads is because they're used for exams and there can be over 200 devices (plus anything in their pocket) connected to a single access point because all the students would be in one big room. I have a feeling bandwidth would be tight and I'd imagine waiting for a video to stream/download during an exam wouldn't be ideal(!)
I guess we'll have to go back to iTunes and sync each device manually 😕