Thanks to Princess_Eev for bringing it to my attention! Little documentation is known about this release, so I will be updating this overtime when more information becomes available, but could be useful for testing.

Instructions: Replace the existing "dash2.exe" with "dash2(HK).exe" in the game's directory, and copy and paste "title.dat" into the game directory's "dat" folder.

(Information taken from Internet Archive): "Press F11 to bring up debug HUD. Press F12 or F2-5 to instantly save to one of the 5 save slots including during cutscenes!"

(Note: This is not to be confused with the other Mega Man Legends 2 debug ISO that exists for PSX)