Voted for FF and group, though I don't see much difference between 'group' and MMF/FFM poses. Since we have two trainers, I think it'll be natural to have FFM poses for women and MMF for men (with normal pose learning procedure).
Poses with more characters involved are probably not worth the time and effort to create (at least, for now!) because the more players are required for a pose, the harder it is to find them.
Poses with more characters involved are probably not worth the time and effort to create (at least, for now!) because the more players are required for a pose, the harder it is to find them.