Not mentioned so far (unless I missed it) is the use of split spoilers for pitch control in the event of stab problems...jammed in the cruise position, for example.
Personally used this twice on the 'ole 707...very handy to have this facility, so you don't have to strong-arm the pole...or even worse, run out of elevator authority.
Or, on takeoff.
DAL had quite a nasty incident with one of their L1011's, when the elevators remained in the full nose-up position after the normal control check (elevators mechanically linked to the all-flying stab) at KSAN.
So, split the spoilers (all off except 1&2 inboard panels), then use the spoiler lever to get the nose down.
Very handy, indeed.