Well thanks for the info. I am afraid I won't be able to tell much about the interesting points of this rom, but I can at least tell after looking that for fe (final edition) it's an entirely new game, no rom is in common with any other neogeo game contrary to most clones usually. And it's not encrypted, logical if it was made by the community.
For the cheats, unibios recognizes the game because it has exactly the same rom id as samsh5sp (special edition), that is $272. The ram usage might be the same, but the rom is very probably different, anyway there are probably only ram cheats in unibios because it deals with real roms most of the time so they are really read only for it.
And by the way fbneo has some source on github too, and it's quite different from mame source actually, which is a surprise because originally it was made for afterburner before it was integrated to mame, and it was something like a showcase, just to demonstrate the game worked well. So I assumed it was based on mame source, I was wrong apparently ! But it's very readable, and this part is easy to understand since there is no crazy encryption like what the special edition has.
It seems to be Japan only, it ignores the region.
I'll check this perfect thing later, it sounds less interesting, this one seems to be just a hack on top of this final edition. But if it has no cheats in unibios it means they changed the id of the rom, so maybe there are some heavy changes there too...
Anyway samsh5fe is added in git.