In spite of the downvotes, this is something I support and intend to facilitate, with some caveats/limitations (preferences and opt-outs might not be applied in Free Play mode). Just be aware that because of how easy it is to bypass clientside limitations, it will almost certainly be possible for people to get around opt-outs by simply editing local XML files.
Edited to just "arctic fox" - one species per vote topic. Feel free to submit "arctic wolf" as a separate topic
Although I cannot add sergals to Rack 2, I have added an alternative species that should suffice: the shark dragon.
They are two distinct species (notably missing are the sergal's pronounced chest bone and their unique feet), but they are similar enough that most people should be able to recreate their sergals as a shark dragon with a reasonable degree of success:
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