I have a rooted Motorola Xoom (Googles own), for the longest time I would bypass the Gmail log-in to go
to the settings and block a message to Cyanogenmod that the ROM had been installed.
As time passed I figured they deserved to know it was being used and by what system, so would
set it up correctly the first time through then disable the Cyanogenmod status checks.
Twas the 9-26-13cm-10.1-20130922-NIGHTLY-wingray update. There's a pattern or sequence I go through
when I install a new Rom the first is to sign in to Google, The 9-26-13 social engineered my Gmail account from me.
The first thing differed in you were to log into Cyanogenmod, I kept using my gmail address until I gave it a moments
thought. Logged into Cyanogenmod then continued into setting up the ROM, I've no reason to of logged into Cyanogenmod.
The signing into Cyanogenmod wasn't necessary to install the ROM but I didn't know at the time, you can/could just skip past that part.
As for my the Gmail account it's only used with my Xoom, with an identity from http://www.fakenamegenerator.com/ so no big deal.
But that signing into Cyanogenmod, was a sign things had changed, so back tracked a version and am staying there.