Dragon Horn max jump of 3

Sure. Open up a hex editor and replace the following lines with EA (aka "NOP", a code that says "skip this").

Code:

Note: In a hex editor, on a headered rom, these will be bytes 021A35-021A39.

C2/1835: C9 10        CMP #$10
C2/1837: B0 03        BCS $183C      (75% chance branch)
C2/1839: EE 70 3A     INC $3A70      (Add 1 attack)

Change to

C2/1835: EA EA
C2/1837: EA EA
C2/1839: EA EA EA

This will remove the chance of a 4th attack from happening.

Excuse my ignorance with hex editing, but this is literally my first time attempting it (my whole mod was created with FF3USME and FF3SE). I tried both WindHex32 and CrystalTile2 hex editors and found "021A35" as you suggested, but the code listed there looked nothing like what you posted. My rom is headered.

The first bit of code looks more like "40 FF 00 FF 00 FF 00 FF 00 FF 00 FF 00 FF 04 FB" and it continues from there (I can't find the code you listed to replace).

Once again, I am a total noob and have only used asm and .ips patches to date.