Steam added a great feature called Steam Input Translation, which maps keyboard controls to button commands. For Final Fantasy VIII, this means the right stick and trigger buttons can be used as they were in the PSX version. However, this feature works by mapping keyboard inputs to the controller. As a result, in-game button prompts, like those for Zell's limit break, appear as keyboard keys (e.g., X, V) instead of controller button labels (e.g., B1, B2).
A possible workaround to make this mod compatible with Steam Input Translation would be to replace the keyboard prompts (e.g., X, V) with button icons that represent the corresponding controller buttons. This should involve a simple modification of the hashmap. I'd attempt it myself if someone could explain how the hashmap files work.