Last Update: April 22, 2013
Script Download
Introduction
This script gives the player the ability to change the party formation in the menu, nothing much else.
Instructions
Plug-n-play, install this script below ACE Menu System and above Main.
Script Conflicts and Compatibility
Requires the script ‘Scene_Base‘ v1.4 or higher
Requires the script ‘ACE Menu System‘ 1.42 or higher
Bigace World 
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I have all the needed scripts and all menu Ace scripts but when I put this in I keep getting an error. I even made sure to have the add on at the bottom of all the ACE scripts and I haven’t edited anything.
Script ‘ACE Menu System Add-on: Menu Formation’ line 151: NameError occurred.
undefined method `open_command: for class `Scene_Menu’
How do I fix the error? It would help my game a lot to be able to change party members easily.