I get asked this quite a bit, so I figured I'd make a forum post.
On the newer Fords that run full time closed loop, people often ask how to make the car richen up sooner at WOT.
It's fairly simple, once the pedal position value is exceeded, wait the amount of time in the delay table, and then use the commanded lambda table.
I do not think any of the Mustang calibrations use the delay table (its zero'd already), but the trucks do use it. The Raptors have a 2-3 second delay before switching from stoich, to the WOT Lambda table.