Regarding "Bad form" check Is this kind of activity allowed? apparently it has the go ahead from one mod and a word of warning from another (which should not be taken lightly, if you have any doubts as to whether something you post is off topic, he will see to it that it is closed).
I find myself asking questions on programmers.SE that could probably get much better answers from the larger user base on stackoverflow. The one good thing about this site is that almost nothing slips through the cracks (for better or worse).
I kinda don't think there can be crossposted stuff between SO and here though, there is too much of a disconnect now between "Opinion Answering" on this site and "Just the facts, dude" on SO. You may be able to crosspost a pronunciation question between the English usage site and this one or a snack suggestion between "Seasoned Advice" and this site. But in each of those cases, the post on this site is probably going to be closed (at least once).
Oh, and I don't think the "migration paths" open up till the site is out of beta (looks like that'll be soon)