in old versions of the game the vagina and balls would "pulse" or "throb" during an orgasm. This no longer seems to be in the game and would be a nice little detail to come back during the games polishing stage.

Testosterone can cause clit growth to a couple of inches, enough that it's more like a mini penis. It'd be nice to see this stage without option for full hermaphrodite.

Somewhere on your character's display and the test subject hud.

This might also come in handy for sizeplay situations, to rule out cub

Maybe add an option how sensitive your character's anal G-spot is, so you can make your character cum hands free by riding your test subject if sensitivity is set to high.

To make things go a bit more smoothly, or very roughly if desired.

I noticed that performing blowjob on a table gives a good position for 69. I don't know whether or not it's planned already, but i think it's possible to add a 69 as a second option to blowjob or as an order that can be given to subject via "talk menu" (i like this option more, i'll be honest).

And of course it would be mega nice if you could perform 69 in all combinations (blowjob/blowjob, cunnilingus/cunnilingus, blowjob/cunnilingus).

Of course that brings some problems like how it should work with size difference and what you should control in that scenario - your head, your pelvis or both?

I think for starters using only your head would be enough. A simple solution would be making the subject to mirror your actions. After that in future you can make the subject "do it" depending on one of their meters.

But of course i'm not telling how it SHOULD be done rather then how it CAN be done.

Some guys produce precum at the drop of a hat, even when flaccid. It would be nice to adjust how easily your character produces precum.

Also being able to adjust how much precum your character produces could be nice.

These controls could be applied to vaginas as well.

If you pull your Cock completely out of her/his Mouth/Pussy/Ass, you can cum on her/his Face, her/his Ass or on her Pussy.

Knot max/min diameter
Tongue width / shape customization. Tongue play?
Tail base diameter, taper ratio, tail tip taper ratio
Ear height/width/taper - Better floppiness
Snout length/width/taper
Better/different teeth - or a custom teeth inlay system

It's the little things :)