Associating Channel9 Profile with a different LiveID? Choosing one when you sign in?

It would be really nice if I could change what LiveID my C9 profile is associated with, as I have several and it's becomming a bit of a pain. For instance, say I want to check my live email in my "@live.com" based live ID; switching from my "@dal.ca" one used on this site is hard enough there, but on this site it's impossible to even choose which live ID you want to first sign in with; clicking "Sign In" logs you in (really quickly) with the last used Live ID. I can sign out again and choose to sign in with a manually typed live ID (the screen doesn't even use the slick new live ID login page, bit of pain in itself) but this is kind of annoying, and it doesn't seem to work all the time. The other day the first time I navigated to this site with my newest live ID, I couldn't even do the sign in, sign out trick since C9 insisted I create a new username when I logged in; I ended up making one named "asafasdasdasd" or something like that just to get through, only to log out and log back in to try and get to my older Live ID.

Other cases besides mine might be on a shared user account, or where someone (friend, colleage, relative) logs in on your browser and suddenly there are >=2 live ID's recognized.

There might already be a way to change the live ID associated with the profile, but a I could find one looking in the profile settings.