There are too many races to include every possibility. We try to emphasize the more well-known races, and beyond that, we have specific requirements for new races such as photorealistic images. Togorians must not have met at least one of the requirements.
With the high number of races SWC currently has, and the fact that many of those races are played by less than 1% (in some cases, less than 0.1%) of the SWC population, races were being added on a very strict set of guidelines, including photorealistic images, which the Togorians lack. They were brought up, but always failed this requirement.
Currently no new races are being considered to be added.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."