I'm making a load of deformation poses so that the loons look different. I want to scale the hands up in a pose so some can have bigger hands. But I don't know which bone to scale to effect the finger too. I think it's "Hand bone geometry" but I can't see/select it in a pose. Will doing it this way cause problems for IK/FK switching?

There are "right_hand_sizer" and "left_hand_sizer" bones in the Generic_Loon (he's the only TWO character with them at the moment, if more need it, it's an easy addition)...there are also poses in the "Animation_Controls/Hand_Controls" folder called "right_hand_sizing" and "left_hand_sizing" that will use those bones to resize the hands. Using these poses or resizing the "sizing" bones shouldn't affect anything else.

Hope that helps, Ken.