Final thought: if you really wish to persist with crossing controls on a swept wing jet, for those who have spoilers incorporated for supplementary or primary roll control, have you thought of what your stall speed becomes when you are in unbalanced flight, with spoilers up on a single wing? I lost a friend in such a case, along with the whole crew when they unfortunately found the answer at 5000' agl.
Can't say that I have thought about it. But it seems to work, so I guess Boeing did think about it.
What happened to the crew at 5,000 feet?