...I think that theft would not be a big issue.
...and they are gone!
What do you mean kokjo?
Even if someone steals one of my computers with the encrypted wallet inside an encrypted folder, they cannot get the bitcoins (I hope).
I can always recover my bitcoins with my paper backup.
I don't have that many bitcoins anyway. Even if they were stolen it wouldn't be a big deal.
Back to my original question:
Is it possible at all to use the same armory wallet in two different computers?
once you think that security is no problem, it becomes a problem.