Ah, I remember reading something about that. I didn't realize those hacks were part of it (I don't even know what they add to the original games, I just wanted to check them out). This whole thing is ridiculous. The only reason this guy could create his modified emulator and ROMs is thanks to the efforts of all the people who freely and nearly unconditionally shared their work with everyone. He wants to benefit from it while imposing his petty conditions (does that even respect MAME's licensing conditions?). It's selfish, immature and shortsighted. He's wilfully limiting the reach of his work, and ensuring his pet projects won't outlive him.
Anyway, sorry for the rant. Thanks for the offer to add cool hacks, barbudreadmon. If I ever stumble on any, I'll let you know.