I don't think no attack is a good idea, mainly because inter is not supposed to have any rules. This rule could be violated on accident by activating mines, causing FD, etc., and in addition to that, if you would be able to do things like lay mines, shoot petrol, or girder/block worms; you'd have to have even more explanation for those things. It would quickly become unnecessarily complicated.
And yeah Kayz, I would have fun just playing bo1. Just because bo3 is better doesn't mean bo1 isn't worth playing. Also, like other schemes, people would be free to play it as bo3 whenever they wish.