If you know enough C to change the code, mini_installer is a good place to start. This is something that people will download anyway, so setting up some of the code there to suit your needs would be best. Install it where you want, make changes before / after installation, etc.
Otherwise, you can write some kind of script that loads and runs the installer, and then changes the settings. For compatibility with your obvious target audience, a simple batch of script would be the best option.
Another option is Chromium Portable . You make any changes you like and download the zip file. All they need to do is download and unzip it. Most users can do this, but the pictures on the download page will not be affected. You can also write a small program or script to download the zip file, unzip it and run everything you need to run (or Chromium it self).
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