I remember seeing a very early mod that would fill the level with water and allowed you to completely flip around while swimming around. I don't think it would be that hard to implement, but it wouldn't really be 'right'. If the alien was looking right side up while hanging onto a cieling, what would that mean? The body would be right side up while the legs are still sticking to the cieling. :/
If the view staied the same after jumping, then you hit another surface, would you want it to 'snap' to that surface then? I suppose it might be a good option, but I don't think I'd like it.