The rimming is good, but maybe hardcore analingus can be added. Deep rimming, or drilling, making the subjects body "move" from the force or sensation. 

The ability to have sex with either favourated test subjects / clients / research subjects or coworkers outside the work enviroment purely for the characters' recreational purposes, perhaps even with dates paths (?)

Tentacle clothing / living clothing is kind of like a Zero suit / latex suit but it's alive and can apply to male and females. Kinda hard to explain but you can look up hentai of it for a better understanding. 

Mummification is obvious. Mummification with latex and other materials while also being able to toy them. Also you could put them inside a mummy box with vibrators and such, which could also account for sensory deprivation.

Aliens / parasites could be good for egg laying and also some could be used on male subjects if the alien / parasite / creature is penetrable.

These are some kind of specific suggestions and fetishes but I wanna know what you think.

A shower stall that could be placed in the lab. Not necessarily one with walls, just a pipe sticking up out of a platform, One with a detachable hose to spray down the subjects.

This suggestion is made with the assumption that cum that lands on the body will stay on the body until washed out or forcefully unloaded by system restrictions.

The shower stall could also be used as a bondage rack, for scrub play, and temperature play.

Alternate options to shower stalls could be shower heads that could be placed on the walls, ceilings and floors. Which are controlled by a control panel.

Perhaps also canes and switches for a bit of rougher play

Here is a troublesome topic: Fek wants to include human characters in R2ck and I think he once said he cannot keep anybody from creating really small characters.

To evade legal trouble I want to suggest to ban characters with certain attributes to be uploaded to RackNET to not step into a grayzone of distributing child pornography. Nobody wants to end up with such stuff on his computer.

Combinations like:

- Small

- Human

- Vagina / small dick

- Flat chest

Should be easy to auto recognise and ban from upload.

I would go as far as disallowing such combinations per se ingame, but at least don't have it shareable on RackNET, it is a huge legal risk for Fek and for those who for whatever reason have such a character offered on client selection.

This sadly is not a far fetched concern. See this case http://www.abc.net.au/news/2008-12-08/fake-simpsons-cartoon-is-child-porn-judge-rules/233562

I wish you could walk your test subject around a room with objects in it to make it wiggle on the inside and once the subject is well aroused and read, you can lock him in place on 4 paw position to fuck tail up face down, and maybe a 3 some function could be a fun addition.

probably a long shot (and most likely not something to add until the game is already done) but maybe add a bit of "off the clock" fun like maybe add a nightclub, shopping center where you can meet npcs (and pick up some new threads) and maybe even an apartment you can head back for some less sciency action sometimes? (or just bring them to the office as a volunteer)

The ability to enter first-person mode when interacting with a test subject. You could have control of the hand and head with a key, such as Caps, to switch between them.