With the new emulator I was finally able to find a value for the character mode in dos. I was able to turn freely around in the modes, but the problem was, that once I changed J into Soma he refused to change back.
It was all J mode, but instead of J i had Soma out. I met alucard and all, but he never joined my party after disappearing. :\
Also J in Soma mode before he turned into a Soma couldn't use any weapons. Once he used one even once he lost all control and I had to backdash to cancel out of it. He also had no animation for that, so he was just standing still.
Sucks, I wanted to play as J with a menu, but once you save and reload he changes into soma permanently.
Edit: However, starting a new soma game, then changing to J while the game loads leads to this:
Too bad save/reload changes it back to normal J mode, but until you do you can collect items and follow the storyline. Ignore the insane stats, they're the product of me messing with the game. The result being 2000-8000 damage hits. :P
Point being, I don't think the J mode with menu would be permanent and saving would most likely just remove it. :\