2K's terms of service says that you cannot distribute modifications of the game.
From Take2's EULA: You agree not to reverse engineer, decompile, disassemble, display, perform, prepare derivative works based on, or otherwise modify the Software, in whole or in part.
From Take2's EULA: You agree not to reverse engineer, decompile, disassemble, display, perform, prepare derivative works based on, or otherwise modify the Software, in whole or in part.