To clarify...yeah, it is the 'mid' switch position that must be the the FS pre-programmed position.....easiest is to use a slider or rotary to get the required 15-30%, hear the slow beeps and you've got the delay. But a rotary/slider may be a different/undesired location change for many of us....e.g., I wanna use the same position and the ease of a switch (see below). And, we do lose the 7-second preprogrammed cool shutdown...but that is of little consequence, I think, as by now, all of us w/ engines using the old ECU know the approximate cool shutdown RPM by ear. Just nudge the thottle a tad for 7-10 seconds before cutting the engine w/ the instant shutdown position.
Testing your FS by shutting the Tx off will immediately indicate the 'mid' position beeps, and on the EDT, indicates a center switch position...but w/o any noticable added ECU delay. So, the way to truly know you have the added delay you requested is w/ the engine running....now when the Tx is shut off, you have the ECU-added delay for FS before engine kill.
As Bruce explained earlier, the FS position for these updated old ECUs is not actually 'mid'. It has to be 15-30%. So, if you've a FS-programmable three position switch you wanna use....well then....you gotta P-mix it (w/Futaba, anyway) to get other than a default 50% at mid. Futaba says this is 'easy' (we'll see

!).....I've talked w/ Dave at Hobbico Futaba Support and he will spoon feed me as to how to accomplish this on Futaba 8s and 9Cs.....which I will pass on here.
Ray