I for one would like to see more interactions in the polycules. I mean, I love being the center of attention, but I would also like to see my partners be more intimate, sexual or romantic.
Improving D/S relationships would also be great. You can't do much with your own submissives actually. Also, one thing that's a little strange is that you can have D/S relationships with people you don't get along with. I understand why it was done initially, but BDSM requires a lot of trust and is not something you practice with someone you don't get along with. Collaring someone is comparable to a marriage in BDSM, unless it's temporary for a specific scene. Also, nothing stops your dom from being your partner, so it should be a different and complementary type of relationship.
The same goes for your fuckbuddies, since even if they are somewhat casual, nothing says they can't join the polycule for fun. By the way, it would be great to be able to ask someone to be your fuckbuddy.
I would put all this on discord, but I can't join. I suspect I need to configure permissions to access communities with explicit content. Anyway, congratulations to the developer and the rest of the contributors, the new content really is great!