There is ccsm (CompizConfig Settings Manager), which, as I understand, is the default configuration tool for Unity desktop... you'll have to install it from a PPA server.
My guess on why it wasn't included in the default installation is because it's quite advanced, and you can break Unity very easily with it (as I once did
) if you don't know what you're doing. Even I would reccomend that only advanced users use this tool (and I'm one that loves to fiddle around with *everything* to see how it works.)
It was a big pain in the a** for me to get everything back to normal when I broke my Unity. Normally, you'd do a unity -reset, but in my version (13.04), that option no longer works. (You'll get an error saying its deprecated, and I never found out the new command to use.)