I see. Just wanted to show you something that's more interesting and have more purposes than quoted text from the wishlist. I'm not a programmer and I have no idea about bullet's possible application but I thought you'll have any use of that and just to voice this idea.
Well, this is SKSE plugin, so I said that.
Many advanced plugins cause CTDs. It's only natural, but they have guides and how-tos to ensure proper setup and avoid problems. I had CTDs but they all happened because I did something wrong while installing mods so I'm the one to blame.
Err... As I said in another topic, it's possible to mod MEGA BOOBS in Morrowind even now so I can't understand what you're trying to say.
It's strange to try to limit modding potential...
Modders are doing what they want and it's a bad idea to try to control them. If someone wants to create body mod, he will try to do it anyway, the only difference is that it will be limited. Or he won't create it at all.
I didn't think of Skyrim as "waifu simulator", although I saw most of the body mods with breasts starting at a-cup and up to something ridiculous, pregnant and etc. But as I was often told "don't want it, don't use it", so I just didn't use what I didn't like.
Regrettably, I didn't like Oblivion (completed many quest being level 1 and got demotivated) and Skyrim (it looked too "generic" for me).
I thought that multitude of body mods is a disadvantage for Skyrim (especially for armor/clothing mods), but some time later main ones were CBBE and UNPB and UNPB is winning (I might be wrong though). It took some time though unlike Morrowind (there were many body mods, but Better Bodies were the best one without any doubt), but there are many other mods. Well, since I don't like Skyrim that much, I can't think what interesting mods are out there. I remember bigger trees, dense vegetation, flora overhaul, over 9000 animation mods, supreme and volumetric fog,lanterns of skyrim, etc etc...
IMHO body sliders can help limit body mods count, but for Skyrim sliders only existed as an external application if I'm not mistaken.
tl;dr Limiting modding capabilities isn't a good idea. Modders will do what they want anyway.
P.S. Excuse me for my English.