You can try using a key remaper like antimicro to bind mouse button and axis to the controller, but it doesn't works well. :/
I don't know what mod are you talking about, but there is a Cheat Engine script table (search for "neptunia cheat engine" it should be the first result) that let's you to rotate the camera in equipment screen and remove tilt/zoom limits on dungeons. I use it to play in "first person" or top view in dungeons, very handy XD.
These tables are for the steam version, but they seem to work fine on the GOG one, even on the latest update.
idk what the mod is either, as the Steam guide that supposedly hosted it went down, along with the files. Whether it was an actual mod or a cheat table or a hacked exe, I'll never know. :'c All I know is there was something
, that supposedly wasn't too hard to use, and it addressed the camera issue. Oh well!
Thanks for the tips about the cheat table and key mapper! I've never used Cheat Engine before, but hearing about what you can do with the camera in dungeons tempts me to get it working. :O