I never knew how you were supposed to do it. Do you do it in the credits of the actual game? Do you add it in the README or Version Notes? Do you make an individual file with the install to thank them?
Does it matter and have to be in a certain system, like editorial citations? Or can you just thank them in any way you want as long as the others can see it?
I personally thank that the beginning/end credits of the game suffices.
A readme document in the game folder could also be a nice touch in addition to the game credits. It wouldn't hurt also to ask each person (if possible) if they would prefer their real name to be used instead of or with their alias name.
I made a special scrolling screen in my own game (since there are many people to be credited).
I've never come that far in the game making, but I thing I should first have it seperated by writing what they do; Scripting, Eventing, Mapping etc. You could also write what parts everyone made, like
========[Mapping]============
Kyra - This and that town
Some other guy - Those castles
=======[Scripts and functions]====
Blizzard - Combat system and Online function
ForeverZer0 - Message System
And so on. If you are uploading your game on a site where most people work with Rpg maker and know about it's scripts, you can write the scripts names instead.
And in the end, you can have special thanks and such
You really only need one area. If you do it in game then I say do some at the beginning (major players) and end (everyone else).