Well, Windows supports * and ? globs, but not brace expansion, as far as I can tell (at least on XP, which is what I currently have access to).

In fact, I don't believe I've run into brace expansion anywhere except in the unix shell, whereas as you say * and ? globbing is fairly common, so that might be another reason *not* to add it :)

Unfortunately for that argument, Windows XP CMD doesn't appear to support [] globbing.

I'm not going to try block this if other people want it.  As you say, there is no real standard here to adhere to.