WebKit could benefit from an "add-file-to-project" script This script would add a new file to all of the various project build systems. Right now we have at least Xcode, Visual Studio and CMake building out of our tree (for os x, win, and linux respectively). If someone made a script then all of the various ports could add their own specific logic for how you add a file (and how to place it in the right groups etc) for the different file times. Xcode may be the hardest (and may require using applescript) Visual Studio and CMake files just mean doing some minimal text editing, a perl script should have no problem with such.
To generic to be useful, and there are a bunch of other bugs with patches for something like this around.