Industrial
That's a very interesting subject.
I used to work on Industrial Olympus - all are based on the 200 series. There is nothing about DEBOW in the manual or any such function in the Fuel Control System. There is a critical speed band though where the LP Spool shouldn't be run at for any length of time. As I recall the Service Bulletin is based around fatigue of the LP Turbine Disk and it was recommend to note the MW output in that band and either set below or above it.
The function of the ones I worked on was Peak Lopping or Black Start; 0 to 25MW (at least) in two minutes from hitting the button was the requirement. And they still are doing that 35+ years after installation !
regards
Howie