[Endoperez]

When there are no commands for something, you can't add or change it. If there's a command for something, you can use the command to change just that aspect of unit/item/site, with restrictions.

Sites can only have four effects: generating X gems of Y, or Z gold, or Å resources, or giving bonus to one school, etc. If Wolven Gate already happened to have four features, you'd have to replace one of the existing ones.

You can change rarity without any trouble, and make sites non-unique. Uniqueness is controlled by the #loc mask, though, so you'd have to lower the value of #loc by the value of unique, 16000-something.