If you mean on units controled during battle, no i dont think you can change it. It`s part of companion file
actions{ use=....
bfight= ....
afight=....}
Bfight part of hex code is bonus companion gives to all units +100attack in this case, afight is what companion do with units during fight i think, so that part of code is what you need to mod to change what units she can control in battle (good luck with that

If you figure out how to `read` that hex code, pls explain because i want to make more composite items which wil acctualy function in game (compose/decompose them in containing items)