I don't know if this has already been done, with the exception of one Tera Patrick movie I saw once, but how about making DVDs where the viewer can decide what comes next. In the TP movie, it was more like a feature and the viewer chose what type of scene it would be, or what someone would say, etc. I'm thinking more along the lines of this for gonzo releases:
Say it is a blowbang, instead of it being all swallowing or all facials, like it typically is, why not let the viewer choose facials or swallowing. It would be shot one way, then the other way. It could be done on successive days, or shoot several guys doing the facials, and then after the girl cleans up she can come back and do the swallowing part with other guys. It could also be used within scenes. The viewer could decide to watch only the anal or DP version, or watch it without any anal.
I know there is a fast forward button, but that isn't the same as being able to watch a scene the way you want it without worrying about FFing. Also, this would probably be more expensive, so maybe that is why it hasn't been done, but I hope they do start making them.