Done on BizHawk 2.2.1, on the mGBA core. The warping still works, but I can't seem to make it happen in the first room like the current run instead; this uses the route from the obsoleted run to warp to the last boss.
This is my current WIP of the game. I finished a TAS of 1-1 I am completely happy with. Go to http://tasvideos.org/forum/viewtopic.php?t=16663 for more information.
My first japanese WIP. As soon as I figure out how save a movie and resume recording from another point I'll be in business.