I haven't seen anyone suggest that their should be an option for whether cards can be captured. I think this would help because if everyone knows you have a bunch of cards from not trading in, they'll just attack you to knock you out and then shore up their boundaries with the cards. If you don't have capture enabled then a your damned if you do or don't situation arrises. You know they'll trade in soon but if you try to knock them out you might leave yourself open to others. This also would stop a person from winning in one turn.
"We spend as much effort on indifference as our parents spent in the war."
It's a huge part of the strategy though. I just won a seemingly hopeless triples game by capturing cards. Of course I almost lost because of that as well, but hey!
Opportune-Moment op·por·tune mo·ment n.
A point in time well suited for doing something incredibly stupid.
Ya, i think it would add more strategy to the game because now people will pour all their troops into taking somone out, then get their cards and destroy everyone.