Quite a lot of desirable features were on the options list for reasons best known to BMW!
But you can retro-fit cruise if you buy the control stalk, although you'll also need to wire it into the loom. There is someone on here who can make that wiring up for beer money, but he's in the UK. Then again shipping a few bits of wire across the pond shouldn't be too expensive.
If you decide to do it when you take of the bottom section of the steering column cowl you'll find markings showing what you need to cut out to fit the stalk.