Those are interesting ideas, but they could use a little refinement... or a lot.
Regarding the first idea, how would this event work? A random chance of (let's give him a placeholder name) Buck showing up everytime Steele takes a drink and is anymore drunk than "buzzed"? Would this be presented in dialogue like the contract signing at Beth's? What about this contract would result in a bad end?
Regarding the second idea; who is Milky? Do you mean Millie? I'm assuming you are referring to the interaction where she gives you "Faux Treatment." I don't see why you'd want to get Treated in this second-hand manner. I could understand if Treated milk had a side effect on those that consumed it, but not getting them addicted (well maybe to the milk itself) or having them get Treated just from drinking the milk... Namely, I'm confused why you want this second-hand Treatment when the real thing is practically free. Personally, I'd like to see this scene go wrong with a small chance for Millie to give you a different TF by mistake...
Finally, idea three. Hmm, slavers treating New Texas as their own wild-life reserve. Not a bad idea, but given that Big T is a rather powerful politician, these slavers would have to be idiots to hunt on his turf...
Regarding the slavers forcing Treatment on people, again, I don't see why that would come about since the real thing is cheap and readily available on New Texas. I mentioned this on a thread I started, but I would think any under-handed types going around forcing TFs on others would be likely to use something less reputable... like say, a black market knock-off of the Treatment being swapped around by space pirates, bounty hunters, and gangsters.