Yes the failsafe options available in the SX limits menu are the same than the ones available for the SE.
I'll try to go to the field this afternoon to do a flight or two and check precisely the acceleration delay.
Concerning the speed captors, I've based my assumptions from memory since the SE is at Jetcat factory for speed sensor trouble shooting.
What drove me to this error is that the guys at Jetcat said they had to change the hall effect sensor...