The ability to use ice as a toy would be nice. For lack of a less graphic way of putting it, inserting smaller pieces of ice into one's butt during sexual activity feels amazing. Being able to do that and more, such as perhaps an ice dildo or something alone those lines, would be fun.

Also, on a similar topic. Wax play might be interesting. Not my bag but it's along a similar vein.

An idea i have been putting in place, is creating a sexual throne chair for (Males/Females) might add a specialty to it such as (Emotional) or some type of bonus.

Ok, so I know Fek has the milking machine planned. What I would like out of this is an automatic mode, where it brings them to orgasm then waits for the next round. Think of it as a set and forget deal.

A concept I've seen a couple times in images or stories is the idea of pleasure/orgasm transfer, where although one person is pumping away at their genitals, all the pleasure is going to the other person, while they feel nothing or feel a lot less. This idea could be incorporated into rack 2 through an orgasm transfer ring. Say subject A is male, and subject B is female. You could put the input ring on As cock, and the output ring on Bs clit. Start pumping away at A, and as he gets closer B is getting more aroused. When A reaches orgasm however, even if you keep pumping, his incoming pleasure immediately drops to zero. Meanwhile B has a spontaneous orgasm, and whatever movements you are still doing on A, the pleasure is transferred to B. So basically you could have the male hit orgasm but then not actually get to have an orgasm, or even make him have a ruined orgasm, as all pleasure has stopped once he's hit the point of no return. Meanwhile the female is having a wild orgasm, squirting all over the place without any actual contact.

I know someone else suggested it 3 years ago but just want to bring more attention to it. The ability to hear the subjects heart and/or see it on a heart monitor would be a neat thing to have since it is medical related!

Add a rack that is basically the table rack, but it's in a vertical position

describe itself but like a chimical like the gigasol but targetable

Hairplay: Giving a handjob and using wet hair too

Tailjobs: Giving a tailjob... Also maybe tails that are penetrable on alien-like species. 

At the current build (0.1.10) it is particularly hard to gather Scalium(Green, Pain) and Avium(Purple, Empathy). Chemical conversion can be performed, but the process for one requires the other and an impass is formed. I propose Empathic and Sensitivity Clips, to aide the gathering of Avium and Scalium respectively. They could be anything, preferably early on in the tech tree, and provided it fits subjects with all sets of genitals. This is recommended as a patch in the current system, and if a new mechanic comes up that should make said patch inferior or obsolete I say all the better