If I had to come up with something, the things I want most would probably be an exploration of the Kitsune species that we can transform into through the Fox/Frostfire items and the Simii species. The closest thing we've gotten to a vulpine race is the Essyrans, but they're clearly their own thing according to their species summary and even then the only two members of the species, Kazra and Lorre, just exist out in the middle of Uveto and don't get any development whatsoever. As for the Simii species, I'm pretty sure the only member we've seen so far is Embry and, while she certainly has more content than Kazra and Lorre, it's only sexual and there's still no further information given about her race. Also, I'd really like a Simii transformation mod added alongside this. Primates are one of the few basic transformations yet to be added to the game and, while fairly basic from a visual standpoint considering humans are also primates and this is supposed to be a crazy sci-fi world where you can become anything, I feel like there's a lot that can be done with those kinds of "subhuman" characters. If you really wanted to go all out with it, you could easily make it just as varied as the Treatment and allow characters to turn into different types of iconic primates, like gorillas, orangutans, baboons, chimps, monkeys, etc. depending on certain factors instead of just going the default monkey rout like Embry appears to be.
Also also, this is on the more selfish side, but I'd really like a bit more variety with the customization items, with particular focus on the accessories and clothing slots (I think the weapons also need a lot more top tier variety, but I understand those are really hard to balance and I'm mostly fine with getting one or two new weapons per month as long as the devs are cautious of power creep). The accessories are pretty much all just jackets or combat drones with a few minor exceptions and all of them are pretty much next to useless from a gameplay perspective, which is crazy considering you'd expect the "accessories" slot to be one of the most customizable aspects of your character. This item slot has the potential to be as complex and interesting as the devs want it to be and it feels like a massive waste for it to be so limited. As for clothes, there's plenty of variety with the undergarments and armor as long as you use your own headcanon to make minor alterations to certain pieces that appeal to your personal preferences, but there's a distinct lack of normal clothing in the mix. I know our characters are supposed to be space adventurers in a sex game and skin tight uniforms and futuristic armor are what you'd expect to see, but we're still supposed to have creative control at the end of the day and "comfortable clothes" that are described as being "generic and indistinguishable" while providing no statistical benefit to your character really isn't cutting it for more normal, down to Earth characters. Stuff like modern dresses, t-shirts, short shorts, jeans, and the like would be greatly appreciated and should be fairly easy to balance considering they aren't supposed to provide much in the way of sexiness or defense compared to the other available options. There are plenty of other things I could add, but I feel like I've covered the most important stuff and this post is already long enough, so thanks for your consideration.