I'm thinking that a way of encouraging greater cooperation between people in raid events is to somehow link raid rewards with the number of people competing...not characters, but the folks at the keyboards. That is, the more folks involved the more items drop.
Not sure how this would be done, but I'm sure it could. Maybe something like a combination of the number of separate IPs and separate locations would get at it most directly (granted there are always computer gurus out there could appear to be separate people but not be...).
Developers are more than busy enough but I think this could be a way to indirectly steer folks toward working with each other more. Perhaps a fun twist to work into a future event or to apply to a few events already in place...