one could write a .dll to replace an entire function in the sh5.exe by using dll injection. The hardest part is deciphering the assembly language and figuring out what it's doing in the game.
Using OllyDebug you can attach to the SH5 process and suspend the game and 'look inside'. There you can figure out what you want to change/replace/add and write a .dll to replace the code wanted (make note of the RVA so you can modify the correct code!)
I'll try and make a dll (with source) that hooks into the main sh5.exe code and executes a function in that dll. Basically what this dll would do is:
- modify the ingame code to 'jump' to your function and execute it
- once the function in the dll is complete it 'jumps' back to the ingame code like nothing ever happened.
- As this new function is now part of the game code it will be called everytime the code comes to that spot
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