Actually the bankswitching probably wasn't the problem exactly. The most popular emulator for a long time was MagicEngine, which uses or used some sort of Hash/Checksum calculation to detect SF2 and emulate the mapper. So if you changed just 1 byte of the ROM, MagicEngine didn't want to emulate the mapper anymore. Atleast that is what I recall running into when I thought it would be easy to just insert the english text into this game. But that was years ago. And there really was no point to it. It could be done, and probably no more difficult than other translation hacks. But until someone just feels like it, it won't happen. It's not like someone is going to do it for fame.