The code on the Vita also works on the PS4 version, but it is a bit different, due to no touchscreen. The following are done at the Main Menu.
Code
Effect
Hold L1 + R1, Press L3
Back 1 Set.
Hold L1 + R1, Press R3
Forward 1 Set.
Touchpad Tricks
Rubbing the touchpad in Aoi's shop causes her to freak out, whilst touching the pad when viewing a character model in the Student Roster fantasy mode causes the girl to react as if she was shot with the pheremone shot.