David Megginson wrote

They managed about an 11:1 glideslope, but the flight crew had
no documentation on optimal glide speed for a 767 (they just
guessed 220 kias), and they left the engines windmilling.

There is no way that the engines can be prevented from windmilling.
In fact, depending upon altitude, 220 kts should provide enough
engine rpm to do an "air start" if required.

Bob Moore