E.G; hand holding, caressing/massaging, kissing (possibly multiple kissing options, like the type of kiss and location of the kiss, such as the neck), flirting, romantic clothing (tuxedos, dresses, lingerie), makeup (any gender could apply it, lipstick could make marks on the body),

romantic lighting/background/music options, romantic decorations

(wine and glasses, fancy clothes strewn across the floor, heart-shaped chocolate, etc),

fuzzy handcuffs/other bondage, actual game functionality, like a love meter or something, so on and so forth.

A drug that creates temporary bezerker-lust in the patient making them fuck-crazy, will fuck anything put in front of them furiously. Perhaps letting them off the rack at another patient? ;)

A late game feature to add programmable conditions to automate sex toys.
For example, could add conditions like:

If Climax <= 90% then Speed = 100%
If Climax > 90% then Speed = 0%

or stuff like

For 1.0 Seconds Speed = 100%
For 0.5 Seconds Speed = 50%

They could just be pre-made logic blocks/options that don't actually require programming knowledge, just a selection of "Conditions" and "Actions" you can choose from and add.

First person VR support

e.g. knotted horsecock on a wolf

I know this is not a thing for everyone, but hear me out. In the preference option your can adjust a slider for animal genitalia on test subjects, as well as (un-)natural fur colors, so that idea wouldn't be far off. Maybe you could add a slider that basically manipulates the probability of that occuring (setting it to the lowest setting disables it completly) and if a subject is selected by that method it will have a random set of privates.

Of course I would understand if that is too difficult to program. Some additional input would be nice.

Adds to sensitivity and makes everything puffier and redder.

Additional options for a chosen special like

Sharks -> Claspers (dual penis)

Female Hyena -> fakepenis

Kangaroo -> balls above penis

Fossa -> double knot

Feline -> Barbs

Or maybe make a list to combine options like

Barbs + knot

Maybe a subject prefers the shape of a cat over that of a horse, or a subject gets off on a specific position faster than the other positions? Adding on to the preferences shown in the first Rack.

Not necesarily ridiculous sized genitalia but still something aroud half the size of a character