I think I'm gone so far with debuff codes now.
I tried to manipulate this way you concatenated the codes to build this hack up:
MAX FIRE DAMAGE
202F5150 24020008 (Oil)
202F5154 A2020019 (Some status ailments group)
202F5158 24040001 (Fire weakness)
202F515C A204001C (Elemental weakness group)
202F5160 24060000 (Bypass fire absorption - set "none" to absorption)
202F5164 A206001D (Elemental absorption group)
202F5168 24080000 (Bypass fire resistance - set "none" to resistance)
202F516C A208001E (Elemental resistance group)
202F5170 240A0000 (Bypass fire immunity - set "none" to immunity)
202F5174 A20A001F (Elemental immunity group)
I equiped a shortbow with fiery arrows and tested the absorption bypass with Firemane. The expected behavior of the fire damage works pretty well, but every enemy have HP/Max HP/MP/Max MP equals 0, and the party get the same when touching the save point or leveling up - maybe, its something due to the bugs bypassing, but I didn't figure out a way to change the script without this happen.