TE flaps have a foreflap or vane so are double slotted.
On the DC10 LE slats have 3 positions Retracted, Take Off, Full Extend so presume MD11 is the same. Normally operated by the Flap lever but on the DC10 it was possible to separate them in non-normal situations.
On the DC10 stick shaker activation would extend the outboard slats to the TO position and lock them there requiring a manual pilot reset to retract them. Again, presume MD11 is similar.