Zheal also did a follow up that has a few more things that were discovered after their first tutorial:

I know this post is super old, but I wrote an autosplitter for GCM. It has some issues where it splits at odd times, but it more or less works correctly.

https://github.com/Johnny-Go/Autosplitters/blob/master/GreatCircusMysteryAutosplit.asl

Which emulators are allowed for this game? Been practicing with the SNES9X core in Bizhawk, but figured I should probably get some official confirmation. I looked in the guides and and the game rules but didn't see any. The closest I saw was that ZSNES doesn't emulate the game properly.