Hey Dave,
I believe that the CGS is a 'general' award. I know it's paid out as a stipend through your university - or at least that's what the award holder's guide says. I'm not 100% certain, but it was my impression, based on conversations with my supervisor, that as long as you're still a student and not applying for the standard research grants, SSHRC scholarship money is yours to live on and spend as you see fit (for research or otherwise). There is nothing in the regulations that stipulates that the CGS must be spent on research-related expenses. I'm certainly hoping this isn't the case
Here's the regulations: http://www.sshrc-crsh.gc.ca/funding-financement/using-utiliser/guide-A/regulations-reglements-eng.aspx