Let me try to explain how adding a new action (like groping or whatever) works and how much time it takes:
1) A new icon has to be added and some lines of code and text. Right now adding a new icon is a bigger problem, because there simply isn't any space left. I've already reduced the icon size to squeeze in the "show breasts" action. So any more and I have to redesign the whole interface in some areas.
2) The poses have to be set up. It's relatively easy if it's just a girl posing with no intervention or interaction with the MC. As soon as it's a mixed interaction, the pose has to be adjusted or even a totally different one has to be used for each girl and sometimes depending on the clothes as well.
3) Right now we have 3 or 4 swim outfits, 3 evening dresses, nurse outfit, 2 reception outfits for each girl. Loading all relevant stuff and setting up a very similar scene with the pose adjustments takes more than 15 minutes on average per girl (you can double that if you need girl *MC). For some the clothes have to be fitted/adjusted as well and the girls's breast posing has to be adjusted (e.g. for push up bras or clothes). So let's say 18 girls * 15 = 270min for scene setup girl alone or twice that for girl + MC.
4) Rendering per image only takes between 3 and 5 minutes. Since I have to change outfits to do the next render and do some adjustments for teh clothes, it's not just PC(render time). I cannot do anything else in the meantime. So another 18*8*4 = 576 min.
5) After all images are done, I postwork most of them in PS. Fix some small issues, change resolution, convert to jpg from png. This is again something between 1 and 2 minutes per image. 18*8*1.5 = 216min
Now if you add all that (not counting Nr. 1), you end up with something about 1.200 min = 20 hours for about 150 renders. That's only 8 minutes per render all included. I cannot work full speed and with dedication on something that is kinda boring and repetitive like that, so it will probably take even longer in the end.
In that amount of time I can do maybe one average length individual scene with sex or an animation.
The main reason for switching to a more story based mode with individual scenes for each girl is that having everything 18 times is not only boring during creation, but also boring and repetitive to play.
Another point is that certain scenes only work with certain types of girls (as in how they look, but also considering their personality). Can you imagine the bad dream/nightmare scene from Yvette with a girl like Amy? It just wouldn't fit. There are also some things (like titfucks or other breast related scenes) that simply won't work with all girls. Same for the special scenes with Ivy. She is just too special and different.