How best to manage AppleIDs for different countries?

Question

We live in Canada, but have a recreational property in the U.S. where we spend several months each winter.
We use AppleTV in both locations, and as such, we have to have AppleIDs associated with both the US iTunes Store and the Canada iTunes Store (which of course means that we have to have credit cards in both countries, which we do).
This is frustrating as we often have to buy the same content twice so as to be able to watch it in two countries... but I understand that this is probably a content owner imposed issue about distribution rights, and not due to Apple.
We used to easily manage this by just switching the AppleID (& country of store) on our MacBooks as we travelled back and forth.
Then Apple introduced a constraint that one could no longer switch between AppleIDs on hardware such as MacBooks and iPads (I believe that one can switch to a new account any time, but cannot switch back to a previously used account until a period of time passes, which I believe used to be 90 days).
Now it seems that one cannot do these account reversals more often than one per year.
It seems like it is getting to the point that one has to have a portable hardware device for each country and use a different AppleID on each in order to have access while travelling to the content that one has paid for in the past.
This was not the case years ago when much of this content was purchased.
Further, when doing upgrades, it is easy when prompted to enter the "wrong" AppleID and then unintentionally lose access to the store in the country that one is currently in (now for up to a year!)
Is there a better way to manage one's accounts across different countries?
Given the constraints on AppleIDs, it is not something that is easy to figure out through experimentation.

Answer 1

We can start applications in a particular screen, since Snow Leopard, similar to what Linux has been able to do for some time; however, these screens are not really desktops, since we can't dedicate certain shortcuts/icons to only appear on certain screens.
Thanks, Eric.  Perhaps I wasn't clear in the above.  I realize we can start applications in certain desktops, but that is NOT what I'm after.
What I would like is the icons (i.e., shortcuts, directories, files) that appear on the desktop, to be different for each desktop.  Such that if I go to Desktop 2, I can place all my game icons/shortcuts there.  Then if I switch to Desktop 3, I might have all my Office programs there, but not my games.  Does that make sense?
Eventually I might also want my Dock to have different icons based on what desktop I'm using, but I figure that's even more difficult.