Hi mechaflash,
What kinds of modification do you think of?
Is it for Advanced UI or Standard UI?
If it is for Standard UI, I could tell you the specific jsp file which you have to modify.
But if it is for Advanced UI, you coud have to modify the
js file with which you have to create archived file to deploy that.
Or you could have to modify the java file with which you have to create jar archived file.
So first let us know what is your plan for customisation so that i can tell you what file you have to modify and where you need to creat archived file with it or not.