what is the problem and why do you need to add a delay? maybe there is another way to solve the problem.
I doubt you can access the special Mori macros as they are in flash ROM and protected from being viewed, changed or deleted.
if you power on while holding the two rightmost keys (arrow right and the next one to its immediate left) you will see the IPL menu.
the macros MAY be in the user area if you are lucky.
you can list user files and copy them to memory card using item 4 SYSTEM DATA SAVE
this applies only to recent Fanuc PC-based controls like 16i/18i/21i
I think even if you could get to them they will be compiled binaries running with the C Executor and unlikely you could edit them and re-write the flash anyway.
you can try looking in normal memory. unlock programs 8000-8999 and 9000-9999 (parameter 3202 bits 0 and 4) and see if they are in memory (I doubt it)
otherwise try contacting Mori Seiki maybe?