Has RetroArch been considered for emulation? Was there reason it's not presently permitted? The .ccd for the objectively better blue Kato works in that engine where I couldn't get it to work in Mednafen.

As a major premise of the emulator used in Speed​​run, if the operation that the actual machine cannot do or the load is fast (PS2 high speed loading or emulator faster than PS3), it will be disabled. Therefore, the available emulators are ePSXe, BizHawk, Xebra, Mednafen, ARBEX etc. RetroArch is a multi-emulator so it's like BizHawk, I found out that the PS1 emulator in RetroArch uses the PCSX-Rearmed emulator. It seems to be playable, but it depends on the moderator.

It also has Beetle PSX HW emulator, but don't know what the difference is between the two