Comment 14 for bug 458872

I'm reluctant to do that because that could be considered a regression and we won't have another beta to test it out. Please note that you can always whitelist the package manually by adding a file called /etc/computer-janitor.d/<whatever>.whitelist

That may in fact lead to an interesting approach. Software Center and/or dpkg could be adjusted to add a .whitelist file whenever a package is manually installed.