I didn't. And I didn't just for this reason, figuring it would not work to my benefit in the long term - as there was only one username/password field so I assumed one account at a time. Hoping for multiple accounts in the future is well hoping for multiple accounts in the future.Switching accounts in the app store is awkward - perhaps this is on purpose but those of us in Canada who bought an iPad in the US before they went on sale in Canada have set up US based accounts and it isn't so easy to switch between accounts which affects updating apps.
All I missed out on was the Apple apps and iBooks for a couple months but everything else was available on the Canadian app store before the Canadian launch (except Scrabble, which again was worth the wait).
Syncing must be a PC issue as I don't have a problem here on my Mac.