Is there a tutorial somewhere that would show me if/how this is possible?
To be more specific, I'd like to be able to adjust activation rates for things like Hamedo.
Reactions have a Br% chance to activate, modifying this would require ASM hacking. It is not a simple patcher edit.
If you want to change just Hamedo, modifying this routine might give you something like what you're looking for:
Pre-Attack Phase (Only checks Hamedo) (https://ffhacktics.com/wiki/Pre-Attack_Phase_(Only_checks_Hamedo))
0017e078: 0c0634e1 jal 0x0018d384 Chance to React
If you want to edit the activation rate of ALL reactions, then the routine being jumped to in that line would need to be edited.
I appreciate the response. I'm not at the level of ASM hacking yet. I figured this was a hard code thing though. Just wanted to make sure I hadn't missed something in the patcher.