How can I change it without causing any conflicts?

And how can I change it for my data_### folder, so I don't have to manually change the addme.script every time?

Munge a new data folder with the new three-character code you want, and then transfer over the necessary source files from the old folder.

Thanks, I assume there is no easier way?

The only other option I can think of is to go through all of the batch files and folders and manually rename all instances of the old code to the new one. Editing the addme.script method is good in the short-run if, say, you were to release your map/mod right afterwards. But if you're going to continue to make changes to your map/mod without the hassle of editing the addme.script every time, munging a new data folder is preferably the way to go, in my opinion. It all comes down to preference really.

id keep it the same and just take out the one thats conflicting, then when your about to release a beta or the map just follow the tutorial, thats what ima do scince mine is -was the same as mavs newest map

Wow...this will help me alot!