I have worked out set rules for each of the races, though brownies wouldn't work in this setting. The way fae have been designed for this story, Sidhe are really the only ones strong enough to exist on the mortal plane for more than an hour or two at a time. If someone wants to play a race not listed, they will need to PM me the race, any details they have on it, and they will, of course, have to accept that as the one running the game, I will make adjustments as needed so that the race isn't overpowered, can actually exist, etc. As of right now, I have abilities listed for various types of weres, so that werewolves are not the only ones available. There is a good bit of reading to get started in the game, though I've worked out a "guide" so to speak, which will point you to exactly what you need to read and the order to read it in to cut down on confusion. :)
And a note: the WoD abilities have been tweaked for the game, just as there are some vampire "clans" that were in WoD but do not exist in this storyline for one reason or another.