Dear FRitz,
How do you mean to change the complete game of BLC eg. coming down the pitch, different nos. on different players etc. by Hex editing ??? Although I have worked with the Hex editor to crack a few softwares for time limits etc. I am not sure that you can change movement command because finally hex editing is trial and error method. But trying this method for large programs (like BLC) it can be really injurious to your P.C's health. Hope you know which parts to edit and how, then I will do the editing for you. You can just use a dissasembler and hiew(Hex editor) to see which parts to edit.