Your morphs really help the teens blend in a bit better with the rest of the 5th gen family.
The facial and scaled body morphs were not only to blend in with the other Gen5 characters, but my line of characters as well. Our M5 reimagining of Santo (which should be hitting the store within the next few days) was thrown off by the size of the teens, so I scaled them down to properly fit as a younger teen; then Santo can be the young adult/ older teen character. Also the DSON update of Ashley is winding through QA again and that included 2 teen characters as well, so the "Tweens" are in line with those figures as well. But with this pack you can put the YT5 in with other characters in a scene and it not look off scale-wise.
I hate those "apply only", often it's a downfall for expression packs. Sliders are there for a very good reason, I rarely if ever use 100% of anything (If its a morph or expression it should be a slider, gives us full control over it and the ability to efficiently customize). But Since it's MaleM3dia, he uses sliders, at least with every M5 product I've bought from him.
The morphs are single sliders since all of them are custom heads bodies, and you can mix percentages of each in addition to the presets that are provided.
Here's an early example of how an un-Tweened Justin (center) fits in with (from left to right) M5, Santo M5, Stephanie 5 and Ashley M5.... then a early render of one of the tweens.
Click thumbnail to see full-size image