Add popup to BBCode button without editing files

[Skavenger]

Hi, I have used this tutorial to create a custom BBCode for my board and I need to give an option to the user to insert a parameter for the BBCode tag, but the only way I know it can be done is editing the vbulletin_textedit.js file.
I want to know if there is another way to do this without editing files. I hate editing files -.-

Thanks.