Just wondering what flap settings most instructors use on base leg.
Ideally, 20 degrees. If high or tight, then go ahead and put in the remaining flaps. Better to be stabilized as soon as possible on final.
danger of a stall/spin accident turning base to final with full flap.
I see no connection whatsoever.
course glide distances
If you lose the engine, raise the flaps. No big deal.