Is anyone else annoyed that if you have a thinner Sim (not even rail thin, just slim or even low average) she'll have small breasts? That's fine on some Sims, but some variety in characters would be nice.
I am sure the normal response would be "EA won't put it in because of their rating." but I think this is silly. They could simply have controls that let you adjust general dimensions on the upper body and legs if they don't want to add a control for breast/chest size. Plus, it could be used for both genders (put barrel chests on a male, etc.)
And, this also addresses the fact you have no control over how wide hips are if your Sim is heavy but you'd rather s/he have slimmer hips than the default for her/his weight. While it may seem like this would allow some unusual builds (tho why does it matter, it's -your- Sims, right?), they could put in reasonable limits of scale so you can't have someone with breasts that would make her nosedive into the ground, or rail thin legs on a huge body.
Height variations I doubt you'll ever see. But the breast size thing I agree with. I'm a boob man myself and would prefer to have a little variety to the Sim world where some woman actually have boobs.
Anyway, the height thing won't ever happen for a valid programming reason. All the animations that involve sims interacting...they would all have to be done with every variation of size and every combination which would increase the workload immensely. Not really worth the time, at least in their minds I'm sure.