I would like to add more options for hair and customization to certain races. I see in the Character Visualset editor there is a button that says 'Add', but it is greyed out, as is 'Replace' and 'Remove'.

How do we add new model pieces to be selected?

GMAddon1: Adds almost every single monster and NPC from the main campaign into GM mode, plus a few large custom maps to use in GM mode.