Can you list out the registry keys that you are trying to setup. I would like to try those myself with my customized build.
the most important one:
The installer runs under the system account, and so that is the "current user" from the installer's perspective. The installer will not enumerate all the user accounts on the computer.
One way to apply that registry setting for each user would be to use group policy. That would allow you to apply registry settings to each user at login.