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@mattvictim,
The creature types are hard-coded to match the creature types defined in the 5E ruleset. Technically, they could be appended to via extension, similar to Savage Worlds discussion above. This was the simplest way to bring death markers to the ruleset, as it requires zero setup for most users.
Also, while I see the thought behind showing semi-transparent or greyed out tokens for the bodies, it would also be confusing for both GMs and players as to whether things are gone or not (especially for GMs who see semi-transparent tokens already for tokens not currently visible to selected token). I'm not sure the gain would be worth the possible confusion. If there were specific "corpse" graphics for each token, that would be an easier concept, but there are not.
Regards,
JPG