BS-X emulation is a relatively recent phenomenon - Radical Dreamers actually behaves very nicely in emulators that know nothing about the BS-X. (The only catch is that sometimes you get a weird menu before you can start the game, but it doesn't cause any problems whatsoever.) That is certainly not the case for all BS-X games, but the same can be said for many of them.
Also, http://www.gamereproductions.com/pro...-Dreamers.html.