Y'know like you can drizzle syrup on the subjects body parts or use a hotdog as a dildo and stuff. Kinda weird I guess.

nipple/clit clamps and/or the ability to pinch

Ever wanted to oil massage a body for foreplay? Spank and squeeze a pair of ass cheeks till you leave a hand shaped red mark behind? Or spread those cheeks open and stretch the asshole with your fingers? Nah? Well, hopefully now you do ;)

Also, foot play could use some time in the sun on Rack 2. A lot more weirdo foot folk (like myself) are finding their awakening nowadays, as evidenced by the Pornhub's most searched suggestions. Maybe not as high up there as "BBC Creams My Wife" or "I Fuck My NOTSister(REAL)", but its pretty popular.

Add the option to cumbrush your subject either with your or their cum

is someting that havent been done even in rack 1, also it would make posible to do multiple actions by a single character

No gore, but if there's an option to modify a subject's body and you alter it sufficiently (e.g. creating a dickgirl/cuntboi/nullo or altering them completely) they remember the gender they were and react variably (e.g. some are happy with their new body and aroused, some are horrified/upset etc etc)

It'd be pretty cool to see a skinny goth otter guy in some metal band shirt, spiked bracelets, and programmer socks getting jacked-off. Or a chubby tiger lady getting buttfucked in a tube-top and platform heels(Neato!).From sports jerseys to bikinis, a little covering can go a long way. A naked body is sexy, but I think sometimes added clothes, revealing or not, can add another pleasant layer to the whole.

Using special table or where you want(maybe on chair)

specifically desperation to pee, subjects trying to cross their legs / not being able to pee bc of an insertion and begging for it to be removed / acting embarrassed / slowly getting more and more panicked