Ive been around a bit, having recently re-installed TS3 after finding the kinkyworld mod (specifically the animalistic side of it) and ive noticed that Herm/Futa/Shemale/dickgirl mods are pretty much non-existent.
this SHOULDNT be too hard to fix, its probably just a matter of configuring the male penis for use with a female model in the game and giving an option to choose that as a gender (maybe? im not quite sure how all this is done, to me its magic).
Set up a gender for those in between. Basically you'd have two types: A Female with a rod but no Lady bits (trans, dickgirl, shemale) and A female with a rod and lady bits (herm, futa).
Add it as a gender preference for sims, and arousal triggers for them as a male would but also as a female.
Add the model for the male bits to female models
give the "other" gender the ability to knock up female sims
for other gender sims remove the strapon for 'male' position placement.
[h]
the other idea i had was an incest kink for the sims, (yes im into some wierd stuff but i know quite a few people who also enjoy it, after all ive even found a TS4 incest mod so its out there)
i imagine there is a Incest mod out there already (i probably even used it when i originally had the game installed)(but i lost the mods when my computer went bellyup) however if this was intergrated in the kinkyworld mod that would be fun.
anyways just a thought.