For your first question, I do think that making a sub-species that is an original creation of yours is allowed. If you think it is too much like a wolf, post it in the character section.
For the second question, I think, if you are going to use it, you should use it in maps. Not many people are going to argue.
Although, I do NOT think it is a good idea, because you are going to get people (of the illiterate type) freaking out how you "swore".
Although, that is my idea, a mod might think otherwise, so ask them! ^^