I've made installers before, but, not being a Mac user I'm not really familiar with compatible tools but I'll try to help anyway. I do believe there are included dev tools for making packages (which ought to be suitable for game mods). There's apparently an application called PackageMaker that will let you create packages for installation on other machines. I don't know much about it, but I did find two articles that may help, especially for the more "techy" Mac user. PackageMaker How-to PackageMaker Pro Tips They seem to be fairly detailed and go into the program in-depth. I hope this helps a bit!
