Finally, if I were to give advice to modders / developers, I'd ask for a content selection mod - scat, watersports, gaping, bestiality, cannibalism etc not only all feature in this game, they are often unavoidable in the course of training. For me these are huge turn-offs and I'd love it if we could control the content to avoid these things.
Second, some more "unique" slaves would be nice - kind of like girl packs used in Brothel King, or the named slaves in Strive4Power, or the majority of the slaves in SlaveMaker3. Let people make post custom-made characters, with images, unique dialog, maybe give them quests and stuff.
Lastly, I wish there were more ways to have sex with slaves outside of Active Sex and the three generic "relaxed" and "rape" options (vaginal, anal, and blowjob). I'd love a "relaxed titfuck", a "relaxed doggystyle", "relaxed bondage fuck" etc.