thats kind of the point, why add an option to manage cloacas just to add exceptions...
lamias and other snakes can have morphs too, why are the higher grades of transformation forcing one if you can disable it for bird and reptile morphs?
anyways, my focus isnt too much in this part of...choice...
it was just a funny observation.
The way it works is that you can choose between a standard genital configuration or a cloaca only if you have a lower torso that allows for meaningful differentiation between front/rear genital/anus positions. If both front/rear layouts are valid, you are allowed to choose which to use (normal, front cloaca, rear cloaca).
A serpentine lower body is not one of these valid types; having a frontal cloaca is a
physical necessity in this case - the anus/rear cloaca position is blocked by your serpent tail continuing straight on from your spine.
Unlike regular tailed creatures, your tail does not start diverging from the body at the hips. That lack of a buttock region means the "back" of your body doesn't end at that point, it keeps continuing downwards.
Furthermore, regardless of whether you have a tailed bipedal/quadrupedal lower body or a serpentine one, if you consider what is the front/belly/underside and back/spine/upper side of the body and tail, you can still see that the genitals are technically on the underside of the body, regardless of whether they're normal/front/rear cloaca mounted - when you have a tail, your anus/rear cloaca is still on the part of the body that segues into the underside of the tail after all.
So since a rear-mounted anus or cloaca with a serpentine lower body doesn't make sense (whether physically or aesthetically), the frontal cloaca configuration is the only option.
