Chat in Team Games

What are the thoughts on making chat in team games default to "Only team mates can see" and make it so you have to check a box if you want all to see your post???
It seems that most of what you have to say is just for your partners anyway and this would stop idiots like me from forgetting to check that stupid little box and giving away plans!
It seems that most of what you have to say is just for your partners anyway and this would stop idiots like me from forgetting to check that stupid little box and giving away plans!