Can you clarify what you mean?
Would you be willing to share a few of your ideas?
1) Buying a contract for the wall means making money by making your holes available to criminals, thugs, pirates, etc. You could of course set yourself as being free to use if you so wish, but the main purpose would be making money.
2) Things like automatically being labeled the more depraved you get. Aphro spit, long tongue, nubby pussy, lots of little things to customize your place in the wall so that you can demand higher prices. Able to present orally and pelvically. Modifying actions based on available variations. Setting a name for the customer to use on you, and even being able to set your own little message next to the wall like seen with Tura: "Want baby-making cumshots", i.e.
Among other things, the ability to actually get pregnant and charge a premium for it, even offering Priapin to whoever wants to take the opportunity. Charge more if you have an unbroken hymen.
I only wrote down unique customers for Oral stuff, I don't see it being necessary or fulfilling when you're getting pounded vaginally or anally. There's plenty of good content in being able to set your wall-slot as having no vision to the outside, or having a camera or something so you can see them. Best kind of thing is when you have no idea who's doing it and all you can get on by is the feeling of a big dick rubbing between your butt cheeks
Special customers included just random things I made up. Like a shy slyveren who's discovering how nice it is to get people paying attention to her pussy. A suula herm with a knotted venom-cock. A double-dicked nerdy gryvain with four balls that output four unique flavors of cum, so you never know what you're gonna get. There's cunnilingus and anilingus involved with several others, and of course, a host of generic figures that could use you on principle, with only a few words. The special NPCs would have the meatiest scenes.
I have a doc of all my ideas laid out if ever I get to see it through. It'd be pure smut that I could probably tackle in a hard, free week.