Sick of only controlling your characters? Control the monsters too!

Cheat device code:
0031731A 00000001

Convert to your cheat device's format, of course.

If you're wondering how such a complicated feature has such a short code, whereas the "Add Ribbon in NA" code was made up of about 20 codes - there's a very simple reason. The control monsters feature is part of the debug menu, so the code only has to turn this option on, nothing else. The reason a code is needed is that there are very few copies of the game which have full access to the debug menu. On the other hand, the Ribbon code had to completely add Ribbon's data to the game.

EDIT: There is one side effect of this code. While it's active, the Magus Sisters and Yojimbo become unuseable. (You can summon them, but they'll do nothing if you use any command other than "Dismiss".)