I don't know how to use rerecording, but someone claims that during Rerecording, Samurai Shodown 5 Special desynchs on FBAS. He says it doesn't desynch on FBA, however. I wonder if you can someday fix it on FBAS, I don't care when or how long it takes. Though out of curiousity, how large is the fix needed?
*UPDATE* I did record a movie of the game on FBAS and I found out what desynch meant. While recording, I went through one intro and one set of opponents. While replaying the rerecording, it went through the other intro and another set of opponents. The recording saved my move inputs, which didn't match the ones when i recorded it, and I "lost" the first fight.