Hi, I'm Cerberus main developer.
First of all, if you have any questions on Cerberus feel free to ask!
Then, regarding the inclusion in ROM Manager, I'd like to explain how and why it happened.
Cerberus has additional features if you integrate it into the rom. It cannot be uninstalled (I mean, it can only be deleted by flashing a new rom or using adb/terminal emulator, but I don't think a lot of thieves know how to do that), and GPS is automatically enabled when you send a "Start tracking" command. So on the website there is a flashable zip for easy installation in /system/app.
A user, who also maintains the ROM Manager repository, told me if I wanted to publish it there too, so integration into the rom would be even easier. Of course I said "Sure, that'd be great"
Now I don't know if there's a specific category into ROM Manager that is fit for Cerberus or whatever, if someone more expert than me wants to write his opinion I'd like to read it.
P.S. If you installed version 1.9beta, there are some nice new features that you can't see yet in the "official" dashboard. More info here: https://docs.google.com/document/d/1.../edit?hl=en_US