Hi Alissa! I'm not planning to add more BDSM for Dalton for the moment. The most BDSM one is on the date at the bar, when they get down to the dungeon. If you haven't seen it yet, drop a message here (but you can also find it on game's help).
I'm not discarding more scenes with him on other storylines, but I have my hands full at the moment. Yeah, I know, it's not the answer you expected. Dalton is one of my all-time favorite characters there :(