I could provide you with details, with 2 caveats:
1.) it would involve patching the memory using something like CheatEngine or hex editing the EXE
2.) There are 4 crisis levels (which determine the power of the limit break, see
this link), always setting this to a fixed level is easy, varying it is harder
Also which language of the game do you have?
for FF8_EN.exe (the Steam English version), there are at least 2 ways to do this, one would be to patch the EXE at 0x9431E or the memory of the process at 0x49431E:
from: 7D04
to: EB09
That will permanently set the crisis level to 4.
The second way to do this (the way the Steam version does it) is patching memory address 0x1CFF838 to 0x01 - which sets the crisis level to always be 1 - you could set it to anywhere up to 4.
However, the addresses would be different for other versions of the game.