RE: Persians or Himalayans?
Breedable Traits, other than Shade, require no programming (per se, it's possible KC has to do some tweaking occasionally, I'd think that highly unlikely). Size (non-breedable) would require some work in-world and might necessitate changes to the web site.
Ears and Tails require 3D modelling to create new sculpt maps. This has some implications and limitations, because they can't be mesh without a major redesign on how the 3D models appear from boxes, docks, and cats when changing prim mode. They also may require new portions of all existing fur trait values, but that may be avoidable with careful modelling (which I'd say they do).
Fur. Eyes, Whiskers require only 2D graphic arts producing a flat image. Fur is probably baked from the models. Eyes and Whiskers are probably simply free-hand work.
Shade, as always, is problematic. It probably requires in-world scripting changes; which would mean an Updater would probably be required.
As to 'long hair' .. remember .. it has to work on a 2D image. There are tricks which can be done to create the illusion of depth and texture, but this may be limited by the small image size and the need to bake it from a 3D model to a 2D image.
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