There needs to be a seperate skin texture place, having to use the tattoo space is inconvenient and wasteful. Also, I think they should have a tab under skin that controls all the textures that are applied to it. That way they would be grouped together, and could have more options allocated to them than there currently are.
Secondly, I think there should be a "cloth prim" the can be affected by physics to deform and bend. This would be useful for things like clothing extensions and hair, as current ones can appear rigid and less believeable.