I don't know if using a different email address will work, because you still have to add your SS# address and the rest of your personal info.
But if you are on Gigspot you cannot sign into the legacy sites of any of the companies that use Shopmetrics. You can only access them through Gigspot, and the MSC's do not post all of their available jobs on Gigspot, so you miss a LOT of opportunities.
It took me 3 weeks, emails, phone calls, and a lot of crap to get out of Gigspot, and I was an idiot and didn't write down the names of the companies that I had been doing jobs for before I was finally released, so I had to try to remember them, I couldn't remember all of them.