[sir_pudding]

Well on one hand Spider Climb says you can "walk" on walls and ceilings, but on the other hand I don't think that it makes that much sense for a Martial Artist to just be standing upside down on the ceiling just like they were on the floor. Even wuxia movies usually have stationary hanging fighters needing three points of contact (although they are often ridiculous three points). So I would allow to make attacks from that position with one limb at a time, but I don't think that applying posture penalties is necessary.