I think one of the great things about this website is this message board and this means of communication with Dave. Even if you don't always (or ever) listen to us, I find it very interesting to get a peek into the thought process and the challenges that go into making these videos.
My personal 2 cents, are as follows: I never actually liked the scenario-driven movies. I don't know why, but they made my uneasy and were not fun to watch. Maybe it was the combination of the contrived scenarios and the poor acting. I like straight-up desperation, but at the same time I agree that having an endless series of model after model doing exactly the same thing does tend to get boring and repetitive. I usually buy a set only if something interesting comes along - some variation on the theme, something interesting in the video description, or at least a prettier model

I think If you keep on doing only the single-model, dining-area, solo desperation, you'll have to keep bringing in new models every week because there is not much point in filming more and more of these with the same model, it will be like making the same movie over and over again.
I like the multi-model holding contests. The wettest link is one of my all time favorites, and I think it could have worked even with a smaller number of models, to keep the cost down. Two-model contests are fun. The latest one where they actually encouraged the other to hold on was a very nice variation on the theme, kept things fresh and interesting.
I used to like the car movies. I'm aware that this topic has been discussed to death and Dave has vetoed it. Still, some of the best ever B2B movies involved car themes - Jayne's "Full Capacity" and "All Dressed Up", Rachael's "Airport Run", Amber (the first Amber) "Traffic Jam" - the list goes on and on - the car ride, much like the bondage movies (which I don't like), forced the models to wait above and beyond what they would normally do. Jaybe was sweating with desperation, Amber practically said (in the "behind the scenes" movie) that movie job or not, she literally cannot continue and can't hold on for another second, she was pushed to her top limit and just HAD to pee RIGHT NOW. The model does not have to pee inside the car and wet the seat. I'm all for a "just made it" where the model jumps out of the car and pees in the woods, her clothes, or even the toilet. Maybe this has to do with the fact that most of the real-life female desperation that I've had the chance of seeing in real life involved long car rides. Talk about voyeurism.
It seems like most of your novel ideas were successful at first. The "Holding it for hours", the "Permission to pee", the "Time to go" - all had a successful run because they were fresh and interesting and were never done before. I bought Becky's private boat-peeing movie just because it was original (only to find it involved only peeing and not desperation so it didn't match my taste so much).
My point is that I think you should be careful about taking only the tried and true path. You should leave at least some percentage of the movies for exploration and experimentation. You never know where you might strike gold.