Short answer, no... based on old discussions, the reason for 2 computers is a desktop and a laptop for travel
Cloud License allows 2 activations at a time http://www.adobe.com/legal/licenses-terms.html
-Install on a 2nd computer http://forums.adobe.com/thread/1452292?tstart=0
-Windows or Mac does not matter... 2 on the same operating system, or 1 on each
-Two activations on one account MAY NOT be in use at the same time (note in the above license link)
I could understand if it was limited to two or three using at the same, but limiting to use at one time is such a rip-off at $50/month. This is why hackers are stealing your stuff Adobe!