The branch you're referring to is only a small section in a rather large game. It
requires a verification TAS of KHFM2 to be considered.
IMHO if a KHFM2 TAS was done that features this
boss rush are it would be something considered for a 100% branch not an arbitrary branch.
Translation Patches are banned.
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PCSX2-RR is not stable.
Just because it syncs for one game doesn't mean it's sync safe for others without careful planning (
and it's been proven).
There is improvement to the emulator I admit, but it isn't justifiable.
BizHawk devs are looking into implementing up and coming DobieStation into the multicore emulator with TAS tools support.
It's just that, that emulator's crux is that it's relatively new, and quite slow at emulation and at the current point is more of a consideration.
However, that emulator has quite the support and might be a submitable TASing emulator in the future.