Do what I did.
1) Install your iPhone with the "normal" BSD Subsystem and Installer.app.
2) Add in this source: http://apptapp.saurik.com
3) Install Cydia (It over rides BSD Subsystem, so don't update THAT after installing Cydia)
Now BOTH Installer.app AND Cydia work!
Then, all you need is to download the "Fake BSD Subsystem" when a new "version" comes out which will trick all apps into believing that you have BSD Subsystem installed, instead of Telesphore (spelling) ...
P.S. I use Installer.app AND Cydia packager for installing apps. It works! I remove all of the sources from Installer that are already included in Cydia! e.g. ModMyiFone repo