Either as an embellishment or some sort of inventory type that can be changed.

Notable types would be facial (ear, nose, lip, eyebrow), nipple, genitalia (clit, penis, labia), and navel. Perhaps a generic body piercing as well.

If it becomes an inventory item, there could be vibrating types in the gyro dock.

Spitball kinks at your subject until they react favorably. Using science!

I would love the ability to enter a posing mode of some sort, similar to the posing feature in the character creator but you can pose at any time instead. I think it would make taking screenshots much more fun and diverse. Adding some more poses would be great as well, such as bending over, kneeling, spreading butt cheeks etc.

Test subjects could start to tremble with growing anticipation and upon seeing preferred actions/tools about to be used on them.

E.g. when they are into sounding and a tool is about to be inserted into them.

Sheathes, Balls, etc. Please?

Where the player is able to point their cock at will and unload (at will?), painting whoever or whatever in seed.

A trope found in most games, heard when a character is low on heath, though in this instance it would play the harder and faster the character is stimulated, perhaps synchronized with the rate the heart on the monitor is blinking at.

The character's heart rate would change depending on the amount of action they're receiving. From slow and subtle while resting, to swift and pounding when they're about to climax, with a period of slowing down after the climax is reached.

I'm thinking your preferences list should also work as likes/dislikes, for example if you say if you're into oral, performing it should turn you on as well as the subject (though obviously not as fast), to the point of being able to cum just from doing it. Seeing subjects enjoy themselves and cum should also arouse you. And yes you're supposed to be a "professional" and a "scientist" that should be used to it by now but come on, it's a porn game in the end.

The tip of the canine cocks bother me a bit, tbh.
I'd love to see a way to make it more anatomically correct without the flare that humans tend to have. This is hybrid, imo.

I really enjoy big cumshots so I would like to be able to set the amout of cum my character unloads to higher than average (maybe related to the size of the balls?). What also would be nice is that the longer the session takes between climaxing, the bigger the load will be.