"but on principle as emulators do give some control to the roms for creating save files etc"
You can check if the emulator gives control to the rom since the emulator is free software; that ensures that we don't really have to worry about that. And of course the game was never designed to be executed within an emulator framework, so the developers weren't able to exploit some holes in the emulator security because they didn't even know about this technology.
And by the way: people already make mods and hacks - that means modified versions of the game, and they share it in the community.
I don't want to say that the situation concerning roms is perfect - it's not - but it's clearly not the same as running ordinary proprietary software on your system.
You can't compare this.
