Superstall requires
both swept wing and T-tail. The T-tail is not their just to confuse, but neither is a Dash 8, for example, susceptible as it has no sweep. There must be pitch up at the stall (from a swept wing) but also the elevators must be in the disturbed air, so a T-tail is required to cause a superstall.
With trailing-edge flaps:
Vortices generally weaker I seem to remember (due to shedding at the flap not jsut the wing tip)
L
ratio reduces
C
Lmax] increased
Effective AoA increases at the moment of deployment unless co-ordinated with nose-down pitch; subsequently as required by speed
Minimum glide range (? not max?) reduced
C
L depends on the AoA as well, but yes
for trailing-edge high-lift devices C
L increases for a given AoA