Not convinced you're reading the replies correctly.
The LEDS are optional/not compulsory. But, if you have them on, they stay on, set or unset.
Their purpose is a bit of a gimmick, feelgood factor, that type of thing. Helps show in the dark that the premises have/pretends to have an alarm.
EWD (bellbox) leds are allowed to flash constantly.
What you don't do is have them indicate set or unset.
eg, only flashing when the panel is set.
The leds are seperate to the strobe, which can/is programmed for different options.